- HörbuchMind MappingKam Knight
- HörbuchSpeed ReadingKam Knight
- HörbuchConcentrationKam Knight
- HörbuchSelf-Talk Your Way to SuccesKam Knight
- HörbuchTriple Your Reading, Memory, and Concentration in 30 MinutesKam Knight
- HörbuchThe Art and Science of VisualizationKam Knight
- HörbuchMemoryKam Knight
- HörbuchMind MapsKam Knight
- HörbuchSerien: Mental PerformanceKam Knight
- HörbuchGoal SettingKam Knight