APA-referens (7:e uppl.)
Wanlass ,lawrence c. (1956). Gettel's history of political thought (2nd ed.). Surjeet publications.
Chicago-referens (17:e uppl.)
Wanlass ,lawrence c. Gettel's History of Political Thought. 2nd ed. New Delhi: Surjeet publications, 1956.
MLA-referens (9:e uppl.)
Wanlass ,lawrence c. Gettel's History of Political Thought. 2nd ed. Surjeet publications, 1956.
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