Book citation .[1]
Book chapter .[2]
Website [3]
- ^ 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.
- ^ La Monte, John (1932). "1". "1 The First Kingdom 1099-1174". Feudal Monarchy in The Latin Kingdom of Jerusalem. Cambridge, MA: Medieval Academy of America. pp. 3–25.
- ^ "Aratea". Facsimile Finder - Medieval Manuscript Facsimiles. Retrieved 2020-04-06.