G. C. · Geoffrey C. · Geoffrey (Geoff) T. Colvin · Geoffrey T. Colvin
| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Angel Customers & Demon Customers | 978-1-59184-128-9 | 2006 | Larry Selden |
| Angel Customers and Demon Customers: Discover Which is Which and Turbo-Charge Your Stock | 978-1-59184-007-7 | 2003 | " |
| Killer Customers: Tell the Good from the Bad--and Dominate Your Competitors | 978-1-59184-042-8 | 2004 | " |
| Talent Is Overrated: What Really Separates World-Class Performers from EverybodyElse | 978-1-59184-294-1 | 2010 | |
| Talent Is Overrated: What Really Separates World-Class Performers from Everybody Else | 978-1-59184-224-8 | 2008 | |
| The Effective Elementary Classroom: Managing for Success | 978-1-57035-044-3 | 1997 | Mike Lazar |