| Verfasser | Häufigkeit |
|---|---|
| Hogan, Rebecca S. | 6 |
| Merrill, Lynn L. | 6 |
| Sawin, Lewis | 6 |
| Casady, R. B. | 2 |
| Sawin, P. B. | 2 |
| Sawin, Patricia | 2 |
| VanDam, J. | 2 |
| Zumwalt, Rosemary Lévy 1944- | 2 |
| IEA-RETD (Organization) | 1 |
| Le Bihan, René | 1 |
| Mabin, Renée | 1 |
| Parke, Ross D. | 1 |
| Sawin, Douglas B. | 1 |
| Sawin, Janet L. | 1 |
| Sawin, Martica | 1 |
| Vos, Rolf de | 1 |