McAlester, A. L. (1977). The history of life (2nd ed.). Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)McAlester, Arcie Lee. The History of Life. 2nd ed. Englewood Cliffs, N.J: Prentice-Hall, 1977.
Lua MLA (9ú heag.)McAlester, Arcie Lee. The History of Life. 2nd ed. Prentice-Hall, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.