Willemstein, S. (1987). An evolutionary basis for pollination ecology. Leiden University Press.
Chicago-čujuhus (17. p.)Willemstein, S.C. An Evolutionary Basis for Pollination Ecology. Leiden: Leiden University Press, 1987.
MLA-čujuhus (9. p.)Willemstein, S.C. An Evolutionary Basis for Pollination Ecology. Leiden University Press, 1987.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.