Cita APA (7th ed.)
Population and demography. Appleton-Century-Crofts.
Cita Chicago (17th ed.)
Population and Demography. New York: Appleton-Century-Crofts.
Cita MLA (9th ed.)
Population and Demography. Appleton-Century-Crofts.
Atenció: Aquestes cites poden no estar 100% correctes.