APA (7e ed.) Bronvermelding

Ayensu, E. S. (1984). Our green and living world: The wisdom to save it. Smithsonian Institution.

Chicago (17e ed.) Bronvermelding

Ayensu, Edward S. Our Green and Living World: The Wisdom to Save It. Washington, D.C: Smithsonian Institution, 1984.

MLA (9e ed.) Bronvermelding

Ayensu, Edward S. Our Green and Living World: The Wisdom to Save It. Smithsonian Institution, 1984.