Schiffman, S. (1998). Make it your business [soundrecording]: The definitive guide to launching, managing and succeeding in your own business. Simon & Schuster.
Παραπομπή σε μορφή Chicago (17η εκδ.)Schiffman, Stephan. Make It Your Business [soundrecording]: The Definitive Guide to Launching, Managing and Succeeding in Your Own Business. New York: Simon & Schuster, 1998.
Παραπομπή σε μορφή MLA (9th εκδ.)Schiffman, Stephan. Make It Your Business [soundrecording]: The Definitive Guide to Launching, Managing and Succeeding in Your Own Business. Simon & Schuster, 1998.
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