What is the Montessori Method?. Gruenberg, S. M. Scientific American, 106(25):564–565, 573, June, 1912.
What is the Montessori Method? [link]Paper  bibtex   
@article{gruenberg_what_1912,
	title = {What is the {Montessori} {Method}?},
	volume = {106},
	copyright = {Public Domain},
	url = {https://hdl.handle.net/2027/pst.000063000061?urlappend=%3Bseq=562},
	language = {eng},
	number = {25},
	journal = {Scientific American},
	author = {Gruenberg, Sidonie Matzner},
	month = jun,
	year = {1912},
	pages = {564--565, 573}
}

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