- https://revistas.ucm.es/index.php/RFRM/article/viewFile/51071/47414
- http://www.usp.br/gmhp/publ/Via28.pdf
- https://ubibliorum.ubi.pt/bitstream/10400.6/1844/5/Domingos%20Gabriel%20Dele%20Zau,%20A%20L%C3%ADngua%20Portuguesa%20em%20Angola.pdf (vogais)
- http://www.rdpc.uevora.pt/bitstream/10174/20820/1/Doutoramento%20-%20Marcio%20Undolo.pdf
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