• Pilgrims and Troubadours: The story of our fifteen-year-long pilgrimage with bicycle, tent and guitar. With black & white pictures.
  
• Pilger und Troubadoure:  The German version of Pilgrims and Troubadours, with full color pictures.
  
• The Myth of the Calorie:  An exploration of how we can go beyond physical explanations of nutrition and metabolism in education and in everyday practice.