- EbookTacticsGregory Koukl
- EbookTactics, 10th Anniversary EditionGregory Koukl
- EbookTactics Study Guide, Updated and ExpandedGregory Koukl
- EbookThe Story of Reality Study GuideGregory Koukl
- EbookThe Story of RealityGregory Koukl
- EbookStreet SmartsGregory Koukl
- EbookRelativismFrancis J. Beckwith
- EbookTácticasGregory Koukl
- EbookStreet Smarts Study GuideGregory Koukl