Progress. Havis, L. Montessori Observer, 9(6):2–4, November, 1988.
bibtex   
@article{havis_progress_1988,
	title = {Progress},
	volume = {9},
	language = {eng},
	number = {6},
	journal = {Montessori Observer},
	author = {Havis, Lee},
	month = nov,
	year = {1988},
	pages = {2--4}
}

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