APA (7th ed.) Citation

Smith, W. C. (1939). Americans in the making: The natural history of the assimilation [!] of immigrants. D. Appleton-Century company.

Chicago Style (17th ed.) Citation

Smith, William Carlson. Americans in the Making: The Natural History of the Assimilation [!] of Immigrants. New York, London: D. Appleton-Century company, 1939.

MLA (9th ed.) Citation

Smith, William Carlson. Americans in the Making: The Natural History of the Assimilation [!] of Immigrants. D. Appleton-Century company, 1939.