Beckwith, H. (1997). Selling the invisible: A field guide to modern marketing. New York: Warner.
シカゴスタイル引用形Beckwith, Harry. Selling the Invisible: A Field Guide to Modern Marketing. New York: Warner, 1997.
MLA引用形式Beckwith, Harry. Selling the Invisible: A Field Guide to Modern Marketing. New York: Warner, 1997.
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