APA (7th ed.) Citation

Greenewalt, C. H. (1975). The flight of birds.

Chicago Style (17th ed.) Citation

Greenewalt, Crawford Hallock. The Flight of Birds. 1975.

MLA (9th ed.) Citation

Greenewalt, Crawford Hallock. The Flight of Birds. 1975.

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