APA (7th ed.) Citation

Mowry, G. E. (1958). The era of Theodore Roosevelt, 1900-1912. Harper.

Chicago Style (17th ed.) Citation

Mowry, George E. The Era of Theodore Roosevelt, 1900-1912. New York: Harper, 1958.

MLA (9th ed.) Citation

Mowry, George E. The Era of Theodore Roosevelt, 1900-1912. Harper, 1958.