Cita APA (7a ed.)

Freedman, R., & Coombs, L. C. (1974). Cross-cultural comparisons: Data on two factors in fertility behavior. The Population Council.

Cita Chicago Style (17a ed.)

Freedman, Ronald, y Lolagene C. Coombs. Cross-cultural Comparisons: Data on Two Factors in Fertility Behavior. New York: The Population Council, 1974.

Cita MLA (9a ed.)

Freedman, Ronald, y Lolagene C. Coombs. Cross-cultural Comparisons: Data on Two Factors in Fertility Behavior. The Population Council, 1974.