Gaya APA

Montessori, M. (2018). The 1915 California Lectures: Collected Speeches and Writings (Volume 15) (Volume 15 in The Montessori Series). Netherlands: Montessori-Pierson Publishing Company.

Gaya MLA

Montessori, Maria. "The 1915 California Lectures: Collected Speeches and Writings (Volume 15)". Volume 15 in The Montessori Series Netherlands: Montessori-Pierson Publishing Company, 2018. Text.