The Montessori Series (English)
- Citizen of the World vol.14€15.00x
- Psychogeometry vol.16a (paperback)€20.00x
- Psychogeometry vol.16b (hardcover)€25.00x
- The 1946 London Lectures vol.17€18.00x
- The 1913 Rome Lectures vol.18€18.00x