General المرجع الشامل في فن البيع

"This book is full of innovative tips, tools and different methods that will make you feel indispensable to buy this book in order to improve your sales""“This book is exactly like the Ten Commandments of Sales. The “Jeffrey” style of selling, contained in this book, has caused the money to increase in my pocket and the pockets of those who work with me in the field of sales. Sales is the most effective I've seen in my 23 years in this profession, so please stop selling this book so competitors don't catch up."