Cita APA (7a ed.)
(1996). World directory of country environmental studies (3a. ed.). World Resources Institute.
Cita Chicago Style (17a ed.)
World Directory of Country Environmental Studies. 3a. ed. Washington, D.C.: World Resources Institute, 1996.
Cita MLA (9a ed.)
World Directory of Country Environmental Studies. 3a. ed. World Resources Institute, 1996.
Precaución: Estas citas no son 100% exactas.