APA (7th ed.) Citation

Landis, P. H. (1954). Population problems: A cultural interpretation. American Book Co.

Chicago Style (17th ed.) Citation

Landis, Paul Henry. Population Problems: A Cultural Interpretation. New York: American Book Co, 1954.

MLA (9th ed.) Citation

Landis, Paul Henry. Population Problems: A Cultural Interpretation. American Book Co, 1954.