Dyfyniad APA

Audesirk, T., Audesirk, G., & Byers, B. E. (2001). Biology: Life on Earth (6th ed.). Prentice Hall.

Dyfyniad Arddull Chicago

Audesirk, Teresa, Gerald Audesirk, and Bruce E. Byers. Biology: Life on Earth. 6th ed. Upper Saddle River, N.J: Prentice Hall, 2001.

Dyfyniad MLA

Audesirk, Teresa, et al. Biology: Life on Earth. 6th ed. Prentice Hall, 2001.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.