Posner, M. J. (1982). Executive essentials: The one guide to what every rising businesspeerson should know. National Book Store.
Παραπομπή σε μορφή Chicago (17η εκδ.)Posner, Mitchell J. Executive Essentials: The One Guide to What Every Rising Businesspeerson Should Know. Manila: National Book Store, 1982.
Παραπομπή σε μορφή MLA (9th εκδ.)Posner, Mitchell J. Executive Essentials: The One Guide to What Every Rising Businesspeerson Should Know. National Book Store, 1982.
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