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 [etc.]: American book company, 1943.

MLA (9th ed.) Citation

Landis, Paul H. Population Problems, a Cultural Interpretation. American book company, 1943.