APA

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

Chicago

Lillard Paula Polk, . 1972. Montessori, a modern approach. New York: Schocken Books.

Harvard

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

MLA

Lillard Paula Polk, . Montessori, a modern approach. New York: Schocken Books. 1972.