Johnston, M. W. (2008). Relationship selling. Boston: McGraw-Hill/Irwin.
Trích dẫn kiểu ChicagoJohnston, Mark W. Relationship Selling. Boston: McGraw-Hill/Irwin, 2008.
ציטוט MLAJohnston, Mark W. Relationship Selling. Boston: McGraw-Hill/Irwin, 2008.
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