APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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