Oruka, H. O. (1994). Philosophy, humanity and ecology: Philosophy of nature and enviromental ethics. Acts.
Tohutoru Kātū Chicago (17th ed.)Oruka, H. Odera. Philosophy, Humanity and Ecology: Philosophy of Nature and Enviromental Ethics. Nairobi: Acts, 1994.
Tohutoro MLA (9th ed.)Oruka, H. Odera. Philosophy, Humanity and Ecology: Philosophy of Nature and Enviromental Ethics. Acts, 1994.
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