Some references for the dates of the beginning of literature in the languages of India. The languages include both the classical languages, Sanskrit and Tamil, as well as the modern vernaculars such as Kannada, Telugu, and Malayalam. For, now, I'm adding only the ones for Tamil.
Tamil literature
editI'd say that the time period 100 BC–250 AD should cover most of the modern scholarly opinion on the antiquity of Tamil literature.
- Aklujkar, Ashok (2008), "Traditions of language study in South Asia", in Kachru, Braj B.; et al. (eds.), Language in South Asia, Cambridge and New York: Cambridge University Press. Pp. 632, pp. 189–220, ISBN 0521781418
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(help) Quote: "Of particular historical importance among surviving non-Sanskrit grammars is Tolkappiyam, a grammar (with a section on poetics), of the old Dravidian language Tamil. It is usually assigned to the early centuries of the Christian era. Preliminary information about Tolkappiyam and other grammars, language-centered accounts, and so on of Dravidian languages can be found in Scharfe (1977: 178–86)." - Encyclopedia Britannica, signed article, "South Asian Arts, Indian lterature: Dravidian literature," by A. K. Ramanujan. Quote:"Early classical Tamil literature is represented by eight anthologies of lyrics, 10 long poems, and a grammar called the Tolkappiyam (“Old Composition”). ... it is generally ascribed to the first three centuries of the Christian Era and represents the oldest non-Sanskrit literature to be found on the South Asian subcontinent."
- Zvelebil, Kamil (1997), The Smile of Murugan: On Tamil Literature of South India: On Tamil Literature of South India, BRILL Academic Publishers. Pp. 378, ISBN 9004035915 Quote: "Chart 1 literature: 1. the "Urtext" of the Tolkappiyam, i.e. the first two sections, Eluttatikaram and Collatikaram minus later interpolations, ca. 100 BC 2. the earliest strata of bardic poetry in the so-called Cankam anthologies, ca. 1 Cent. BC–2 Cent. AD."
- Encyclopedia Encarta 2008. Signed article "Indian Literature" Archived 2009-01-24 at the Wayback Machine by Indira Viswanathan Peterson. Quote: "In southern India, beginning in the 1st century AD, a magnificent body of nonreligious poetry was written in the Tamil language."
- Seaver, Sanford B. (1998), The Dravidian Languages, Taylor and Francis. Pp. 436, ISBN 0415100232. Quote: "Of all the Dravidian languages Tamil has the longest literary tradition, covering more than two thousand years. ... the earliest extant literary text is the grammar Tolkappiyam (100 BCE), which describes the grammar and poetics of Tamil during that period."
- Krishnamurti, Bhadiraju (2003), Dravidian Languages, Cambridge and New York: Cambridge University Press Quote: "The first known work, Tolkappiyam, is a treatise on grammar and poetics ascribed to the early pre-Christian era, presupposing a large body of literature before it, available in the form of anthologies. Although the influence of early Sanskrit grammars (fifth century BC) is obvious in certain grammatical concepts ... there is much that is original in Tolkappiyam."
- Ramanujan, A. K. (1985), Poems of Love and War: From the Eight Anthologies and the Ten Long Poems of Classical Tamil, New York: Columbia University Press. Pp. 329, ISBN 0231051077 Quote: "Early classical Tamil literature (c. 100 BC–AD 250) consists of the Eight Anthologies (Eţţuttokai), the Ten Long Poems (Pattuppāţţu), and a grammar called the Tolkāppiyam or the 'Old Composition.' ... The literature of classical Tamil later came to be known as Cankam (pronounced Sangam) literature."
- Hart, George L.; Heifetz (translators), Hank (2002), The Purananuru: The Four Hundred Songs of War and Wisdom: An Anthology of Poems from Classical Tamil, New York: Columbia University Press. Pp. 320, ISBN 0231115636
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has generic name (help) Quote: "The Purananuru is an anthology of 400 poems written between the first and third centuries CE by more than 150 poets, ... The language is old Tamil, the precursor of modern Tamil and Malayalam. Comprising one of the eight "Sangam" anthologies, the Purananuru is among the earliest works in Tamil that we possess." - Hart, George L. (2000), Tamil as a classical language. "Its oldest work, the Tolkappiyam, contains parts that, judging from the earliest Tamil inscriptions, date back to about 200 BCE. The greatest works of ancient Tamil, the Sangam anthologies and the Pattuppattu, date to the first two centuries of the current era."
- Das, Sisir Kumar; Sahitya Akademi (2005), A History of Indian Literature, 500–1399, New Delhi: Sahitya Akademi. Pp. 302, ISBN 8126021713. Quote: "The time around 9th and 10th century is significant in the history of Indian languages, it being the time when most of the modern Indian languages, the Indo-Aryan as well as the Dravidian (excluding Tamil which has had a continuous literary history since the beginnings of the Christian era) emerged as distinct speeches, ..."
- George, K. M.; Sahitya Akademi (1992), Modern Indian Literature, an Anthology: Surveys and Poems, New Delhi: Sahitya Akademi, ISBN 8172013248 Quote: "... the more developed Dravidian languages are four: Tamil, Kannada, Telugu, and Malayalam, and they are located in the south. Among them Tamil has a very special place. It has the longest literary tradition, extending to over two thousand years, next only to Sanskrit."
- Myer, Hanna; Singh, Karan; et al., India 2001: Reference Encyclopedia, South Asia Publications, ISBN 094592142X
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(help) Quote: "TAMIL : Oldest of the Dravidian languages, and one of the earliest spoken languages in the world (500 BC). The Tolkappiyam, meaning "Old Composition," is a work from the Sangam period (1-4 century AD) codifying Tamil grammar, ..." - Crystal, David (2001), A Dictionary of Language, Chicago and London: University of Chicago Press. Pp. 390, ISBN 0226122034 Quote (p. 333): "Tamil: A member of the Dravidian family of languages ... It is written in the Tamil alphabet, found in inscriptions dating from the 3rd century BD, with a literature tradition from the 1st century AD, thus (apart from Sanskrit) providing the oldest literature in India."
- Cutler, Norman (2005), "Tamil Hindu Literature", in Flood, Gavin (ed.), The Blackwell Companion to Hinduism, Malden and Oxford: Blackwell Publishing. Pp. xiii, 599., pp. 145–158, ISBN 1405132515 Quote (p. 146): "One of the great achievements of Tamil culture in the field of literature is the corpus of over 2,300 poems collected in the eight so-called cankam anthologies. ... The earliest poems in this corpus were probably composed in the first few centuries CE."