Cita APA (7a ed.)

Roth, J. A., & Ryan, J. F. (2000). COPS Program After 4 Years-National Evaluation. United States Department of Justice, National Institute of Justice.

Cita Chicago Style (17a ed.)

Roth, Jeffrey A., y Joseph F. Ryan. COPS Program After 4 Years-National Evaluation. United States Department of Justice, National Institute of Justice, 2000.

Cita MLA (9a ed.)

Roth, Jeffrey A., y Joseph F. Ryan. COPS Program After 4 Years-National Evaluation. United States Department of Justice, National Institute of Justice, 2000.