APA (7th ed.) Citation

Smith, B. (1949). Police systems in the United States (Rev. and enl.). Harper.

Chicago Style (17th ed.) Citation

Smith, Bruce. Police Systems in the United States. Rev. and enl. New York: Harper, 1949.

MLA (9th ed.) Citation

Smith, Bruce. Police Systems in the United States. Rev. and enl. Harper, 1949.