Cita APA (7a ed.)

Case, E. C., & Bergsmark, D. R. (1943). Modern world geography: Economic and social. J.B.Lippincott.

Cita Chicago Style (17a ed.)

Case, Earl C., y Daniel R. Bergsmark. Modern World Geography: Economic and Social. Chicago: J.B.Lippincott, 1943.

Cita MLA (8a ed.)

Case, Earl C., y Daniel R. Bergsmark. Modern World Geography: Economic and Social. J.B.Lippincott, 1943.