Cita APA (7th ed.)

Gottfried, S. (1990). Biology, annotated teachers edition (Rev. 5th ed.). Prentice-Hall.

Cita Chicago (17th ed.)

Gottfried, Sandra. Biology, Annotated Teachers Edition. Rev. 5th ed. Elglewood cliffs, NJ: Prentice-Hall, 1990.

Cita MLA (9th ed.)

Gottfried, Sandra. Biology, Annotated Teachers Edition. Rev. 5th ed. Prentice-Hall, 1990.