Leff, H. (1978). Experience, environment & human potentials. Oxford uni.press.
Lua i Stíl Chicago (17ú heag.)Leff, Herbert. Experience, Environment & Human Potentials. New York: Oxford uni.press, 1978.
Lua MLA (9ú heag.)Leff, Herbert. Experience, Environment & Human Potentials. Oxford uni.press, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.