Ackerman, B. A. (1974). The uncertain search for environmental. The Tree Press.
Lua i Stíl Chicago (17ú heag.)Ackerman, Bruce A. The Uncertain Search for Environmental. The Tree Press, 1974.
Lua MLA (9ú heag.)Ackerman, Bruce A. The Uncertain Search for Environmental. The Tree Press, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.