Cita APA (7th ed.)

Fifield, R. H., & Pearcy, G. E. (1944). Geopolitics in principle and practice. Ginn.

Cita Chicago (17th ed.)

Fifield, Russell Hunt, i George Etzel Pearcy. Geopolitics in Principle and Practice. Boston: Ginn, 1944.

Cita MLA (9th ed.)

Fifield, Russell Hunt, i George Etzel Pearcy. Geopolitics in Principle and Practice. Ginn, 1944.