Cita APA (7th ed.)
International Union for Conservation of Nature and Natural Resources 1987. (1987). Population and sustainable development. IUCN.
Cita Chicago (17th ed.)
International Union for Conservation of Nature and Natural Resources 1987. Population and Sustainable Development. Gland: IUCN, 1987.
Cita MLA (9th ed.)
International Union for Conservation of Nature and Natural Resources 1987. Population and Sustainable Development. IUCN, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.