Tohutoro APA (7th ed.)
Pearcy, G. E. (1944). Geopolitics in principle and practice.
Tohutoru Kātū Chicago (17th ed.)
Pearcy, G. Etzel. Geopolitics in Principle and Practice. Boston [usw.], 1944.
Tohutoro MLA (9th ed.)
Pearcy, G. Etzel. Geopolitics in Principle and Practice. 1944.
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