"The Absorbent Mind" by Maria Montessori. 1995.
Review or buy at Amazon.com.

"Discovery of the Child" by Maria Montessori. 1996.
Review or buy at Amazon.com.

"The Secret of Childhood" by Maria Montessori. 1992
Review or buy at Amazon.com.

"Montessori - A Modern Approach" by Paula Polk Lillard. 1996.
Review or buy at Amazon.com.

"Montessori Today: a Comprehensive Approach From Birth to Adulthood" by Paula Polk Lillard. 1996.
Review or buy at Amazon.com.

"Montessori in the Classroom: a Teacher's Account of How Children Really Learn" by Paula Polk Lillard. 1997.
Review or buy at Amazon.com.

"A Parent's Guide to the Montessori Classroom" by Ailene Wolf. 1988.
Review or buy at Amazon.com.

"Maria Montessori: An Autobiography" by Rita Kramer. 1988.
Review or buy at Amazon.com.

"Maria Montessori: Her Life and Work" by E. Mortimer Standing. 1995.
Review or buy at Amazon.com.