Cita APA

Welty, J. C. n. 1. (1975). The life of birds (2nd edition.). Philadelphia: W. B. Saunders Company.

Citación estilo Chicago

Welty, Joel Carl n. 1901. The Life of Birds. 2nd edition. Philadelphia: W. B. Saunders Company, 1975.

Cita MLA

Welty, Joel Carl n. 1901. The Life of Birds. 2nd edition. Philadelphia: W. B. Saunders Company, 1975.