Cita APA (7a ed.)

Spengler, J. J., & Duncan, O. D. (1956). Population theory and policy: Selected readings. Free Press.

Cita Chicago Style (17a ed.)

Spengler, Joseph J., y Otis Dudley Duncan. Population Theory and Policy: Selected Readings. Glencoe: Free Press, 1956.

Cita MLA (8a ed.)

Spengler, Joseph J., y Otis Dudley Duncan. Population Theory and Policy: Selected Readings. Free Press, 1956.