King, G. Secrets of Selling: How to win in any sales situation (2.). Pearson Education UK.
Citazione stile Chigago Style (17a edizione)King, Geoff. Secrets of Selling: How to Win in Any Sales Situation. 2. Pearson Education UK.
Citatione MLA (8a ed.)King, Geoff. Secrets of Selling: How to Win in Any Sales Situation. 2. Pearson Education UK.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.