Books by Maria Montessori:

1. The Montessori Method
2. Dr. Montessori's Own Handbook
3. The Absorbent Mind
4. The Advanced Montessori Method
5. The Montessiri Elementary Material
6. The Discovery Of The Child
7. Spontaneous Activity In Education
8. The Mother And The Child
9. The Child In The Family
10. To Educate The Human Potential

Books by Friedrich Froebel:

1. The Education Of Man
2. Pedagogics Of The Kindergarten
3. Education By Development
4. Froebel's Letters Of The Kindergarten

Books by Magda Gerber:

1. The RIE Manual: For Parents And Professionals
2. Your Self-Confident Baby (This book is not available at archive.org)

All these useful and free resources in English can be found at archive.org. Here parents can find eBooks on Montessori, Froebel and Waldorf education that can be downloaded to a PC or electronic reading devices.