Charles J. Krebs. (2001). Ecology. San Francisco: Benjamin Cummings.
Trích dẫn kiểu ChicagoCharles J. Krebs. Ecology. San Francisco: Benjamin Cummings, 2001.
MLA引文Charles J. Krebs. Ecology. San Francisco: Benjamin Cummings, 2001.
警告：這些引文格式不一定是100％准確.