Oruka, H. O. (1991). The philosophy of liberty: An essay on political philosophy. Standard Textbooks.
Lua i Stíl Chicago (17ú heag.)Oruka, H. Odera. The Philosophy of Liberty: An Essay on Political Philosophy. Nairobi: Standard Textbooks, 1991.
Lua MLA (9ú heag.)Oruka, H. Odera. The Philosophy of Liberty: An Essay on Political Philosophy. Standard Textbooks, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.