- A Harmony of the GospelsRobert L. Thomas, Stanley N. Gundry
- Evangelical hermeneuticsRobert L. Thomas
- Zondervan NASB exhaustive concordanceRobert L. Thomas
- New American standard exhaustive concordance of the BibleThomas, Robert L., Robert L. Thomas
- Three views on the origins of the Synoptic GospelsRobert L. Thomas
- How to Choose a Bible VersionRobert L. Thomas
- Entendamos los Dones EspiritualesRobert L. Thomas