Não informado. (1966). Programmed learning and educational technology. Association for Programmed Learning.
Citace podle Chicago (17th ed.)Não informado. Programmed Learning and Educational Technology. London: Association for Programmed Learning, 1966.
Citace podle MLA (8th ed.)Não informado. Programmed Learning and Educational Technology. Association for Programmed Learning, 1966.
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