Cita APA (7a ed.)

(2005). McDougal Littell life science. McDougal, Littell.

Cita Chicago Style (17a ed.)

McDougal Littell Life Science. Evanston, Ill: McDougal, Littell, 2005.

Cita MLA (9a ed.)

McDougal Littell Life Science. McDougal, Littell, 2005.