According to Kramer, "the major works published before 1920 (The Montessori Method, Pedagogical Anthropology, The Advanced Montessori Method—Spontaneous Activity in Education and The Montessori Elementary Material), were written in Italian by her and translated under her supervision."
Σύμφωνα με την Kramer, «τα σημαντικότερα έργα που κυκλοφόρησαν πριν το 1920 (The Montessori Method, Pedagogical Anthropology, The Advanced Montessori Method—Spontaneous Activity in Education and The Montessori Elementary Material) γράφτηκαν από την ίδια στα Ιταλικά και μεταφράστηκαν υπό την επίβλεψή της».