Sibley, Charles G.; Ahlquist, Jon E. (1990), Phylogeny and Classification of Birds: A Study in Molecular Evolution, New Haven and London: Yale University Press, pp. 976, ISBN978-0-300-04085-2
Sibley, Charles G.; Monroe, Jr., Burt L. (1990), Distribution and Taxonomy of Birds of the World, New Haven and London: Yale University Press, pp. 1111
Sibley, Charles G.; Monroe, Jr., Burt L. (1993), Supplement to Distribution and Taxonomy of Birds of the World, New Haven and London: Yale University Press, pp. 108, ISBN0-300-05549-8