APA (7th ed.) Citation

Regier, C. C. (1957). The era of the muckrakers. P.Smith.

Chicago Style (17th ed.) Citation

Regier, Cornelius C. The Era of the Muckrakers. Gloucester, Mass.: P.Smith, 1957.

MLA (8th ed.) Citation

Regier, Cornelius C. The Era of the Muckrakers. P.Smith, 1957.