The Constructive Triangle (1974-1989). Volume 3, no. 1 , American Montessori Society, New York, NY, 1976.
The Constructive Triangle (1974-1989) [link]Paper  bibtex   
@book{noauthor_constructive_1976-1,
	address = {New York, NY},
	title = {The {Constructive} {Triangle} (1974-1989)},
	volume = {3, no. 1},
	copyright = {Open Access - CC BY-NC},
	url = {http://hdl.handle.net/11134/20002:859940129},
	language = {eng},
	publisher = {American Montessori Society},
	year = {1976}
}
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