Cita APA (7a ed.)

Langworthy, R. H., & Travis, L. F. (1999). Policing in America: A balance of forces (2nd ed.). Prentice Hall.

Cita Chicago Style (17a ed.)

Langworthy, Robert H., y Lawrence F. Travis. Policing in America: A Balance of Forces. 2nd ed. Upper Saddle River, N.J: Prentice Hall, 1999.

Cita MLA (9a ed.)

Langworthy, Robert H., y Lawrence F. Travis. Policing in America: A Balance of Forces. 2nd ed. Prentice Hall, 1999.