APA (7th ed.) Citation

Helm, W. P. (1947). Harry Truman, a political biography. Duell, Sloan and Pearce.

Chicago Style (17th ed.) Citation

Helm, William Pickett. Harry Truman, a Political Biography. New York: Duell, Sloan and Pearce, 1947.

MLA (9th ed.) Citation

Helm, William Pickett. Harry Truman, a Political Biography. Duell, Sloan and Pearce, 1947.

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