| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 2008 | 978-0-9818758-1-1 | Charles Joseph Coolidge | The Squaredime Letters: Moving From a Mechanical to an Organic Business Model |
| 2015 | 978-0-9818758-2-8 | CJ Coolidge | People Driven Life: 50 Timeless Principles to Increase Your Income and Life Satisfaction |
| '' | 978-0-9818758-3-5 | '' | People Driven Selling: How to Sell More, Work Less, and Have More Fun |