Happiness. Havis, L. Montessori Observer, 13(2):2–4, May, 1992.
bibtex   
@article{havis_happiness_1992,
	title = {Happiness},
	volume = {13},
	language = {eng},
	number = {2},
	journal = {Montessori Observer},
	author = {Havis, Lee},
	month = may,
	year = {1992},
	pages = {2--4}
}

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