Levine, J. a. M. (1993). Biology. Prentice-Hall, Inc.
Lua i Stíl Chicago (17ú heag.)Levine, Joseph and Miller. Biology. Englewood Cliffs, New Jersey: Prentice-Hall, Inc, 1993.
Lua MLA (9ú heag.)Levine, Joseph and Miller. Biology. Prentice-Hall, Inc, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.