Cita APA (7a ed.)

Wadman, R. C., & Allison, W. T. (2004). To protect and to serve: A history of police in America. Pearson/Prentice Hall.

Cita Chicago Style (17a ed.)

Wadman, Robert C., y William Thomas Allison. To Protect and to Serve: A History of Police in America. Upper Saddle River, NJ: Pearson/Prentice Hall, 2004.

Cita MLA (9a ed.)

Wadman, Robert C., y William Thomas Allison. To Protect and to Serve: A History of Police in America. Pearson/Prentice Hall, 2004.