Blackman Jeff. (2003). Stop Whining! Start Selling!: Profit-Producing Strategies for Explosive Sales Results. American: Wiley.
Chicago Style citaatBlackman Jeff. Stop Whining! Start Selling!: Profit-Producing Strategies for Explosive Sales Results. American: Wiley, 2003.
MLA citatieBlackman Jeff. Stop Whining! Start Selling!: Profit-Producing Strategies for Explosive Sales Results. American: Wiley, 2003.
Let op: Deze citaties zijn niet altijd 100% accuraat.