(2005). McDougal Littell life science. McDougal, Littell.
Cita Chicago (17th ed.)McDougal Littell Life Science. Evanston, Ill: McDougal, Littell, 2005.
Cita MLA (9th ed.)McDougal Littell Life Science. McDougal, Littell, 2005.
Atenció: Aquestes cites poden no estar 100% correctes.