Cita APA (7th ed.)

Friedman, D., & Butz, W. P. (1972). Laissez-faire in population: The least bad solution.

Cita Chicago (17th ed.)

Friedman, David, i William P. Butz. Laissez-faire in Population: The Least Bad Solution. New York Population Council, 1972.

Cita MLA (9th ed.)

Friedman, David, i William P. Butz. Laissez-faire in Population: The Least Bad Solution. 1972.