"E. K." · E. Klapp · O. Klapp · Orrin E. Klapp
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Collective search for identity | 978-0-03-073105-1 (0-03-073105-4) | 1969 |
| Currents of Unrest: An Introduction to Collective Behavior | 978-0-03-085305-0 (0-03-085305-2) | 1972 |