| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Shepherd Trilogy: A Shepherd Looks at the 23rd Psalm, A Shepherd Looks at the Good Shepherd, A Shepherd Looks at the Lamb of God | 978-O-551-O3O7O-1 (O-551-O3O7O-4) | 1996 |
P.K. · P. Keller · W. K. · W. Keller · W.P.