Cita APA (7a ed.)

Landis, P. H. (1948). Population problems: A cultural interpretation. American Book Company.

Cita Chicago Style (17a ed.)

Landis, Paul Henry. Population Problems: A Cultural Interpretation. New York: American Book Company, 1948.

Cita MLA (9a ed.)

Landis, Paul Henry. Population Problems: A Cultural Interpretation. American Book Company, 1948.