Torrance, J. (1979). Higher biology. Edward Arnold.
Lua i Stíl Chicago (17ú heag.)Torrance, James. Higher Biology. Great Britain: Edward Arnold, 1979.
Lua MLA (9ú heag.)Torrance, James. Higher Biology. Edward Arnold, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.