Cita APA (7th ed.)

Case, E. C., & Bergsmark, D. R. (1983). Modern world geography, economic and social. J. B. Lippincott Company.

Cita Chicago (17th ed.)

Case, Earl Clark, i Daniel R. Bergsmark. Modern World Geography, Economic and Social. Philadelphia: J. B. Lippincott Company, 1983.

Cita MLA (9th ed.)

Case, Earl Clark, i Daniel R. Bergsmark. Modern World Geography, Economic and Social. J. B. Lippincott Company, 1983.