As stated in the introduction to this text, "the present volume is based upon the lectures given by Dr. Maria Montessori at Ahmedabad, during the first Training Course after her internment in India." Additionally, this version is based on notes from the lectures, so it is based on notes by students – not Montessori's own writings. Montessori, M. (1949). The Absorbent Mind. The Theosophical Publishing House. https://archive.org/details/in.ernet.dli.2015.202650.
Much of the following information comes from: Open Worldcat (https://worldcat.org); and Association Montessori Internationale, "Book List" (Amsterdam: AMI, April 1995) [1 folded sheet].
This was a new English-language translation of the text, by Claude A. Claremont, based on the revised, updated, and expanded version Montessori wrote in Italian. Montessori, M. (1967). The Absorbent Mind (C. A. Claremont, Trans.). Holt, Rinehart and Winston. OCLC299938660