Não informado. (1964). Programmed learning. Association for Programmed Learning.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Programmed Learning. London: Association for Programmed Learning, 1964.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Programmed Learning. Association for Programmed Learning, 1964.
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