Cita APA (7a ed.)
(1991). Protected areas of the world: A review of national systems. IUCN.
Cita Chicago Style (17a ed.)
Protected Areas of the World: A Review of National Systems. Gland, Switzerland: IUCN, 1991.
Cita MLA (9a ed.)
Protected Areas of the World: A Review of National Systems. IUCN, 1991.
Precaución: Estas citas no son 100% exactas.