C. G. · Carolin Grünig · Caroline Grimshaw
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Fun and Gains: Motivate and Energize Staff with Workplace Games, Contests and Activities | 978-0-07-470770-8 (0-07-470770-1) | 2001 |
| The Fun Factor: Games, Sales Contests and Activities that Make Work Fun and Get Results | 978-0-07-470434-9 (0-07-470434-6) | 1997 |