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2. Allen, Bruce, ?Patterns of Intersection?,Arithmetic Teacher 15, 560?61; Oct. 1968.
3. Ausubel, David P., ?Some psychological and educational limitations of learning by discovery?,Arithmetic Teacher 11, 290?302; May 1964.
4. Biggs, Edith, ?What's your position on the role of experience in the learning of mathematics??,Arithmetic Teacher 18, 278?95; May 1971.
5. Bittinger, Marvin L., ?A review of discovery?,Mathematics Teacher 61, 140?46; Feb. 1968.