APA Citation

Hellmayr, C. E. (1929). A contribution to the ornithology of northeastern Brazil. Chicago.

Chicago Style Citation

Hellmayr, C. E. A Contribution to the Ornithology of Northeastern Brazil. Chicago, 1929.

MLA Citation

Hellmayr, C. E. A Contribution to the Ornithology of Northeastern Brazil. Chicago, 1929.

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