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.
There has been confusion regarding Montessori's association with The Theosophical Society and during her stay in India she openly proclaimed that she was not a member. This was in fact accurate, but it was discovered posthumously that Montessori had in fact been a member of the society at one point. She joined the European Section of the Society on 23 May 1899, however sometime thereafter, "her membership was later dropped, although the date is not known." Wilson, C. (1985). Montessori was a Theosophist. History of Education Society Bulletin, 36, 52–54. http://www.kelpin.nl/fred/download/montessori/english/theosophist.pdf
Additional publications by Maria Montessori are listed in the Montessori Bibliography Online compiled by Joel Parham and connected with the Center for Learner Agency Research and Action.
Montessori, Maria (1992). "Address by Dr. Maria Montessori at the First (Preliminary) Meeting of the Governing Board (Wiesbaden, June 19, 1951) [translated from the German original]". The 40th Anniversary of the UNESCO Institute for Education. UNESCO Institute for Education. pp. 49–51.
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