| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Exceptional Seven Percent: The Nine Secrets of the Worlds Happiest Couples | 978-O-8O65-2358-3 (O-8O65-2358-1) | 2002 |
G. K. · G.M. · G. P. · Gregory K. Popcak · Gregory Msw Popcak · Gregory Popcak · K&M · k.m.p. · K.P. · M P