- eBookThe Thirty-Six Strategies of Ancient ChinaStefan Verstappen
- eBookDefense Against the PsychopathStefan Verstappen
- eBookThe Art of Urban SurvivalStefan Verstappen
- eBookBlind Zen, Martial arts and Zen for the blind and vision impairedStefan Verstappen
- eBookThe Little Warriors Street Safety Teachers GuideStefan Verstappen
- eBookLittle Warriors Street Safety WorkbookStefan Verstappen