Blackman, J. (2004). Stop whining! Start selling!: Profit-producing strategies for explosive sales results. Hoboken, N.J: Wiley.
Čikaški stil citiranjaBlackman, Jeff. Stop Whining! Start Selling!: Profit-producing Strategies for Explosive Sales Results. Hoboken, N.J: Wiley, 2004.
MLA način citiranjaBlackman, Jeff. Stop Whining! Start Selling!: Profit-producing Strategies for Explosive Sales Results. Hoboken, N.J: Wiley, 2004.
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