APA (7th ed.) Citation

Montessori, M. (1936). The secret of childhood / by M. Montessori. Orient Longmans.

Chicago Style (17th ed.) Citation

Montessori, Maria. The Secret of Childhood / by M. Montessori. Orient Longmans, 1936.

MLA (9th ed.) Citation

Montessori, Maria. The Secret of Childhood / by M. Montessori. Orient Longmans, 1936.

Warning: These citations may not always be 100% accurate.