| Verfasser | Häufigkeit |
|---|---|
| Kipper, Greg | 2 |
| Blackwood, Raymond | 1 |
| Cole, Eric | 1 |
| Drake, Phil | 1 |
| Green, Ron | 1 |
| Long, Johnny | 1 |
| O'Brien, Dennis | 1 |
| O'Reilly for Higher Education (Firm) | 1 |
| O'Shea, Kevin | 1 |
| Rogers, Russ | 1 |
| Safari, an O'Reilly Media Company | 1 |
| Schroader, Amber | 1 |
| Wiles, Jack | 1 |
| Withers, Donald | 1 |