Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Fifiel, Ruseell H., y G. E. Pearcy. Geopolitics in Principle and Practice. 1944.

Cita MLA (8a ed.)

Fifiel, Ruseell H., y G. E. Pearcy. Geopolitics in Principle and Practice. 1944.