Book Citation: [1]
- ^ Rawles, James (2009). How to Survive the End of the World as We Know It: Tactics, Techniques, and Technologies for Uncertain Times. New York City: Plume. pp. 1–50. ISBN 0452295831.
Book chapter citation [1]
Article Citation [2]
Website Citation [3]
- ^ La Monte, John (1932). "1 The First Kingdom 1099-1174". Feudal Monarchy in The Latin Kingdom of Jerusalem. Cambridge, MA: Medieval Academy of America. pp. 3–25.
- ^ Dekker, Elly (2010). "THE PROVENANCE OF THE STARS IN THE LEIDEN "ARATEA" PICTURE BOOK". Journal of the Warburg and Courtauld Institutes. 73: 1–37. ISSN 0075-4390.
- ^ "Aratea". Facsimile Finder - Medieval Manuscript Facsimiles. Retrieved 2020-04-06.