APA (7th ed.) Citation

Lillard, P. P. (1972). Montessori, a modern approach. Schocken Books.

Chicago Style (17th ed.) Citation

Lillard, Paula Polk. Montessori, a Modern Approach. New York: Schocken Books, 1972.

MLA (9th ed.) Citation

Lillard, Paula Polk. Montessori, a Modern Approach. Schocken Books, 1972.