Rewards and Punishments. Havis, L. Montessori Observer, 9(3):2–4, May, 1988.
bibtex   
@article{havis_rewards_1988,
	title = {Rewards and {Punishments}},
	volume = {9},
	language = {eng},
	number = {3},
	journal = {Montessori Observer},
	author = {Havis, Lee},
	month = may,
	year = {1988},
	pages = {2--4}
}

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