The Importance of Multi-age Grouping. The American Montessori Society Public School Montessorian, 7(1):20–21, 1994.
The Importance of Multi-age Grouping [link]Paper  bibtex   
@article{the_american_montessori_society_importance_1994,
	title = {The {Importance} of {Multi}-age {Grouping}},
	volume = {7},
	url = {https://archives.lib.uconn.edu/islandora/object/20002%3A860340983#page/20/mode/2up},
	language = {eng},
	number = {1},
	journal = {Public School Montessorian},
	author = {{The American Montessori Society}},
	year = {1994},
	pages = {20--21}
}

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