Covert, Jack. , 800-CEO-READ, Jeffrey Gitomer's Little Red Book of Selling: one of The 100 Best Business Books of All Time, November 2008.
بازبینی‌شده در ۲۲ ژوئیه ۲۰۱۸.  «800-CEO-READ, Jeffrey Gitomer's Little Red Book of Selling: one of The 100 Best Business Books of All Time».