APA (7th ed.) Citation

Ober, F. A. (1906). Columbus the discoverer. Harper & Brothers publischrs.

Chicago Style (17th ed.) Citation

Ober, Frederick A. Columbus the Discoverer. New York and London: Harper & Brothers publischrs, 1906.

MLA (9th ed.) Citation

Ober, Frederick A. Columbus the Discoverer. Harper & Brothers publischrs, 1906.