Lovejoy, A. O. (1965). The Great chain of being: A study of the history of and idea (6 edición.). Harper.
Lua i Stíl Chicago (17ú heag.)Lovejoy, Arthur Oncken. The Great Chain of Being: A Study of the History of and Idea. 6 edición. New York: Harper, 1965.
Lua MLA (9ú heag.)Lovejoy, Arthur Oncken. The Great Chain of Being: A Study of the History of and Idea. 6 edición. Harper, 1965.
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