Cita APA (7th ed.)

Cohen, J. E. (1995). How many people can the earth support? Norton.

Cita Chicago (17th ed.)

Cohen, Joel E. How Many People Can the Earth Support? New York: Norton, 1995.

Cita MLA (8th ed.)

Cohen, Joel E. How Many People Can the Earth Support? Norton, 1995.

Atenció: Aquestes cites poden no estar 100% correctes.