Wachtel, J. (1983). Police undercover work: Issues and practice. Univ. Microfilms Internat.
Cita Chicago Style (17a ed.)Wachtel, Julius. Police Undercover Work: Issues and Practice. Ann Arbor, Mich: Univ. Microfilms Internat, 1983.
Cita MLA (9a ed.)Wachtel, Julius. Police Undercover Work: Issues and Practice. Univ. Microfilms Internat, 1983.
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