Cita APA (7a ed.)

Trewartha, G. T., & Sale, R. B. (1972). The less developed realm: A geography of its population. Wiley & Sons.

Cita Chicago Style (17a ed.)

Trewartha, Glenn Thomas, y Randall B. Sale. The Less Developed Realm: A Geography of Its Population. New York [etc.]: Wiley & Sons, 1972.

Cita MLA (9a ed.)

Trewartha, Glenn Thomas, y Randall B. Sale. The Less Developed Realm: A Geography of Its Population. Wiley & Sons, 1972.