Cita APA (7th ed.)

Freeman, S., & Hamilton, H. (2005). Biological science (2nd edition.). Pearson Prentice Hall.

Cita Chicago (17th ed.)

Freeman, Scott, i Healy Hamilton. Biological Science. 2nd edition. Upper Saddle River, N.J: Pearson Prentice Hall, 2005.

Cita MLA (9th ed.)

Freeman, Scott, i Healy Hamilton. Biological Science. 2nd edition. Pearson Prentice Hall, 2005.