The Montessori bead material. Communications: Journal of the Association Montessori Internationale, 1979. Number: 4
abstract   bibtex   
Has a good explanation of why children must make their own problems.
@article{noauthor_montessori_1979,
	title = {The {Montessori} bead material},
	abstract = {Has a good explanation of why children must make their own problems.},
	number = {4},
	journal = {Communications: Journal of the Association Montessori Internationale},
	year = {1979},
	note = {Number: 4}
}

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