Otiende, J. E. (1991). An introduction to environmental education. Nairobi Univ Press.
Lua i Stíl Chicago (17ú heag.)Otiende, James E. An Introduction to Environmental Education. Nairobi: Nairobi Univ Press, 1991.
Lua MLA (9ú heag.)Otiende, James E. An Introduction to Environmental Education. Nairobi Univ Press, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.