8 books • 3 series
The Ultimate Business Communication Book
The Ultimate Negotiation Book
The Ultimate Sales Book
Nauchis' vliyat' na liudej za 7 dnej
Selling in 4 Weeks
Persuasion And Influence In A Week (In A Week)
Successful Customer Care in a Week: Teach Yourself (TYW)
NLP for Business Excellence (Trainer's Activity Packs S.)