1
Gordon, Robert C.
| Evangelical Missions Information Service |
1973
3
Boettcher, Robert
| Holt Rinehart and Winston |
1980
5
Gordon, Robert P.
| Paternoster Press |
1988
6
Gordon, Robert P.
| Paternoster Press |
1988
8
Gordon, Robert P.
| Paternoster Press |
1991
10
Maccini, Robert Gordon
| JSNT Press |
1994