Gaya APA

G.Sibley, C., Ahlquist, J, E. (1991). Phylogeny and Classification Of Birds : A Study In Molecular Evolution . London: Yale University Press.

Gaya MLA

G.Sibley, Charles., Ahlquist, Jon, E.. "Phylogeny and Classification Of Birds : A Study In Molecular Evolution". 0 London: Yale University Press, 1991. Text.