APA aipamena

Harper, R. A., & Schudde, T. H. 1. (1973). Between two worlds: A new introduction to geography. Houhgton Mifflin.

Chicago Style aipamena

Harper, Robert Alexander, and Theodore Henry 1940 Schudde. Between Two Worlds: A New Introduction to Geography. Boston: Houhgton Mifflin, 1973.

MLA aipamena

Harper, Robert Alexander, and Theodore Henry 1940 Schudde. Between Two Worlds: A New Introduction to Geography. Houhgton Mifflin, 1973.