APA (7th ed.) Citation

Thorp, W., & Thorp, M. F. (1944). Modern writing. American book company.

Chicago Style (17th ed.) Citation

Thorp, Willard, and Margaret Farrand Thorp. Modern Writing. New York, Cincinnati [etc.]: American book company, 1944.

MLA (8th ed.) Citation

Thorp, Willard, and Margaret Farrand Thorp. Modern Writing. American book company, 1944.