APA (7th ed.) Citation

Landis, P. H. (1943). Population problems: A cultural interpretation. American Book Company.

Chicago Style (17th ed.) Citation

Landis, Paul H. Population Problems: A Cultural Interpretation. New York ; Cincinnati [et cetera]: American Book Company, 1943.

MLA (9th ed.) Citation

Landis, Paul H. Population Problems: A Cultural Interpretation. American Book Company, 1943.