APA (7th ed.) Citation

Haas, O. (1960). Lower Cretaceous ammonites from Colombia, South America.

Chicago Style (17th ed.) Citation

Haas, Otto. Lower Cretaceous Ammonites from Colombia, South America. New York, NY, 1960.

MLA (9th ed.) Citation

Haas, Otto. Lower Cretaceous Ammonites from Colombia, South America. 1960.

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