Sheehan, D. (1981). Shut up and sell: Tested techniques for closing the sale / Don Sheehan ; foreword by Norman Vincent Peale. National Book Store.
Chicago-referens (17:e uppl.)Sheehan, Don. Shut Up and Sell: Tested Techniques for Closing the Sale / Don Sheehan ; Foreword by Norman Vincent Peale. [Manila]: National Book Store, 1981.
MLA-referens (9:e uppl.)Sheehan, Don. Shut Up and Sell: Tested Techniques for Closing the Sale / Don Sheehan ; Foreword by Norman Vincent Peale. National Book Store, 1981.
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