- The Ever Changing Garden: Soil Fertility, Renewal, and Preservation: Man's Search for Harmony in Garden Design
- Eloquent Concrete: How Rudolph Steiner Employed Reinforced Concrete
- Erziehung zur Freiheit. Die Pädagogik Rudolf Steiners
- Rudolf Steiner's Sculpture in Dornach
- The Goetheanum: Rudolf Steiner's Architectural Impulse