APA

Stephens D. W., Krebs J. R., . (1986). Foraging Theory. New Yersey,Princeton: princeton University Press.

Chicago

Stephens David W, Krebs John R, . 1986. Foraging Theory. New Yersey,Princeton: princeton University Press.

Harvard

Stephens D. W., Krebs J. R., . (1986). Foraging Theory. New Yersey,Princeton: princeton University Press.

MLA

Stephens David W, Krebs John R, . Foraging Theory. New Yersey,Princeton: princeton University Press. 1986.