The Constructive Triangle: Quarterly for the Formation and Information of American Montessori Teachers (1965-1973). Volume 8, no. 3-4 , American Montessori Society, Broadview Heights, Ohio, 1973.
The Constructive Triangle: Quarterly for the Formation and Information of American Montessori Teachers (1965-1973) [link]Paper  bibtex   
@book{noauthor_constructive_1973,
	address = {Broadview Heights, Ohio},
	title = {The {Constructive} {Triangle}: {Quarterly} for the {Formation} and {Information} of {American} {Montessori} {Teachers} (1965-1973)},
	volume = {8, no. 3-4},
	copyright = {Open Access - CC BY-NC},
	url = {http://hdl.handle.net/11134/20002:859937349},
	language = {eng},
	publisher = {American Montessori Society},
	year = {1973}
}

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