2. Positioning, written by AL Ries and Jack Trout;
3. Free: the best business model, by Wu Shuai;
4. sales psychology written by Hengli;
5. Trading Above All, Meng;
6. Jeffrey Gitmore's Bible of Sale;
7. Customer service and customer complaints and complaint handling skills, by Zhu Yuhua;
8. Execution of Huawei, written by Sun;
9. Internal training manual of absolute closing words, written by philip kotler;
10. Introduction training for sales novices, written by Xiao Jianzhong.