Oruka, H. O. (1994). Philosophy, humanity and ecology: Philosophy of nature and enviromental ethics. Acts.
Čikaški stil citiranja (17. izdanje)Oruka, H. Odera. Philosophy, Humanity and Ecology: Philosophy of Nature and Enviromental Ethics. Nairobi: Acts, 1994.
MLA način citiranja (9. izdanje)Oruka, H. Odera. Philosophy, Humanity and Ecology: Philosophy of Nature and Enviromental Ethics. Acts, 1994.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.