APA (7th ed.) Citation

Bergtold, W. H. (1928). A guide to Colorado birds. [The Smith-Brooks printing company].

Chicago Style (17th ed.) Citation

Bergtold, William Harry. A Guide to Colorado Birds. [Denver, Col]: [The Smith-Brooks printing company], 1928.

MLA (9th ed.) Citation

Bergtold, William Harry. A Guide to Colorado Birds. [The Smith-Brooks printing company], 1928.