"callender, patricia . "
programmed learning: its developmemt and structure/ patricia.. callender - 1 ed. - uk : longman 1969. - "xii, 117p.; 21 cm."
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371. 394 4 cal
programmed learning: its developmemt and structure/ patricia.. callender - 1 ed. - uk : longman 1969. - "xii, 117p.; 21 cm."
--
371. 394 4 cal