APA (7th ed.) Citation

Olson, S. L., & Feduccia, A. (1980). Presbyornis and the origin of the Anseriformes (Aves, Charadrimorphae). Smithsonian Institution Press.

Chicago Style (17th ed.) Citation

Olson, Storrs L., and Alan Feduccia. Presbyornis and the Origin of the Anseriformes (Aves, Charadrimorphae). Washington: Smithsonian Institution Press, 1980.

MLA (9th ed.) Citation

Olson, Storrs L., and Alan Feduccia. Presbyornis and the Origin of the Anseriformes (Aves, Charadrimorphae). Smithsonian Institution Press, 1980.

Warning: These citations may not always be 100% accurate.