Stephens, D. W. a. K. (1988). Foraging theory. Princeton Univ. Press.
Chicago Style aipamenaStephens, David W.; and Krebs. Foraging Theory. Princeton, New Jersey: Princeton Univ. Press, 1988.
MLA aipamenaStephens, David W.; and Krebs. Foraging Theory. Princeton Univ. Press, 1988.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.