Oppenheim, e. C. (1989). Perspectives in information management 1. Butterworths.
Čikaški stil citiranja (17. izdanje)Oppenheim, ed. Charles. Perspectives in Information Management 1. Butterworths, 1989.
MLA način citiranja (8. izdanje)Oppenheim, ed. Charles. Perspectives in Information Management 1. Butterworths, 1989.
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