| Titel | ISBN-13 (ISBN-10) | Erschei- nungsjahr | andere Autoren |
|---|---|---|---|
| Dealing with Price Objections and Justifying Price Increases: With Training Exercises | 978-3-920663-81-4 (3-920663-81-0) | 1992 | etc. · Dennis Tomlinson |
| Guide to Effective Telemarketing | 978-3-920663-26-5 (3-920663-26-8) | 1993 | Jim Tappenden · Fiona Watson |