Gaya APA

Krebs, C, J. (1994). Ecology; The Experimental Analysis of Distribution and Abudance (Ed. 4). America: Harper Collins College Publisher.

Gaya MLA

Krebs, Charles, J.. "Ecology; The Experimental Analysis of Distribution and Abudance". Ed. 4 America: Harper Collins College Publisher, 1994. Buku PPS Pend. Biologi.