(1991). Resources, enviroment, and population: Present knowledge, future options. The Population Council.
Chicago-Zitierstil (17. Ausg.)Resources, Enviroment, and Population: Present Knowledge, Future Options. Nueva York: The Population Council, 1991.
MLA-Zitierstil (9. Ausg.)Resources, Enviroment, and Population: Present Knowledge, Future Options. The Population Council, 1991.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.