Rijn, P. P. v., Cofer, C. N., & Hermanson, R. H. (1975). Programmed learning aid for thinking and conceptual behavior. Learning Systems Company.
Citace podle Chicago (17th ed.)Rijn, Paul P. van, Charles N. Cofer, a Roger H. Hermanson. Programmed Learning Aid for Thinking and Conceptual Behavior. Homewod, Illinois: Learning Systems Company, 1975.
Citace podle MLA (9th ed.)Rijn, Paul P. van, et al. Programmed Learning Aid for Thinking and Conceptual Behavior. Learning Systems Company, 1975.
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