Παραπομπή APA

Wallenstein, G. D. (1968). Concept and practice of product planning. New York: American Management Association.

Παραπομπή Chicago Style

Wallenstein, Gerd D. Concept and Practice of Product Planning. New York: American Management Association, 1968.

Παραπομπή MLA

Wallenstein, Gerd D. Concept and Practice of Product Planning. New York: American Management Association, 1968.

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