Stephens, D. W., & Krebs, J. R. (1986). Foraging theory. Princeton University Press.
Chicago-čujuhus (17. p.)Stephens, David W., juo John R. Krebs. Foraging Theory. Princeton: Princeton University Press, 1986.
MLA-čujuhus (9. p.)Stephens, David W., juo John R. Krebs. Foraging Theory. Princeton University Press, 1986.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.