R. J. Havighurst ancd others. School Science and Mathematics, October, 1942
School Science and Mathematics
O. Riddle and others. The Science Press, March, 1942
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Oscar Riddle; The Preparation of High-School Science Teachers. The American Biology Teacher 1 December 1942; 5 (3): 63–65. doi: https://doi.org/10.2307/4437346
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