Morgan, R. (1965). Environmental biology. Pergamon.
Lua i Stíl Chicago (17ú heag.)Morgan, R.F. Environmental Biology. Oxford: Pergamon, 1965.
Lua MLA (9ú heag.)Morgan, R.F. Environmental Biology. Pergamon, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.