APA (7th ed.) Citation

Harper, R. A., & Schmudde, T. H. (1973). Between two worlds : a new introduction to geography: A new introduction to geography. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Harper, Robert A., and Theodore Henry Schmudde. Between Two Worlds : A New Introduction to Geography: A New Introduction to Geography. Boston: Houghton Mifflin, 1973.

MLA (9th ed.) Citation

Harper, Robert A., and Theodore Henry Schmudde. Between Two Worlds : A New Introduction to Geography: A New Introduction to Geography. Houghton Mifflin, 1973.

Warning: These citations may not always be 100% accurate.