Manning, E. W. Practical Instruction for Detectives: A Complete Course in Secret Service Study.
Čikaški stil citiranja (17. izdanje)Manning, Emmerson Wain. Practical Instruction for Detectives: A Complete Course in Secret Service Study.
MLA način citiranja (9. izdanje)Manning, Emmerson Wain. Practical Instruction for Detectives: A Complete Course in Secret Service Study.
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