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Marilyn Frankenstein, Arthur B. Powell
Science and Nature 9/10: 100-112.
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Arthur B. Powell, Oshon L. Temple
Teaching Children Mathematics 7(6): 369-375.
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Stephen Danley, Gayle Christiansen
The Journal of School & Society 4(1): 47-62.
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Martin Hoffman, Arthur B. Powell
Mathematics teaching 126: 55-57.