Cita APA (7a ed.)

Roper, L. E. L. (1981). Law enforcement selection requirements: A national analysis. Univ. Microfilms Internat.

Cita Chicago Style (17a ed.)

Roper, Leah E. L. Law Enforcement Selection Requirements: A National Analysis. Ann Arbor, Mich: Univ. Microfilms Internat, 1981.

Cita MLA (8a ed.)

Roper, Leah E. L. Law Enforcement Selection Requirements: A National Analysis. Univ. Microfilms Internat, 1981.