APA (7th ed.) Citation

HARPER, R. A. (1973). Between Two Worlds: A new introduction to geography. Houghton Mifflin.

Chicago Style (17th ed.) Citation

HARPER, Robert A. Between Two Worlds: A New Introduction to Geography. Houghton Mifflin, 1973.

MLA (8th ed.) Citation

HARPER, Robert A. Between Two Worlds: A New Introduction to Geography. Houghton Mifflin, 1973.

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