Cohen, J. E. (1995). How many people can the earth support? Norton.
Cita Chicago Style (17a ed.)Cohen, Joel E. How Many People Can the Earth Support? New York: Norton, 1995.
Cita MLA (8a ed.)Cohen, Joel E. How Many People Can the Earth Support? Norton, 1995.
Precaución: Estas citas no son 100% exactas.