(1981). A Systems approach to teaching and learning procedures: A guide for educators (Second edition revised and expanded.). Unesco Press.
Citace podle Chicago (17th ed.)A Systems Approach to Teaching and Learning Procedures: A Guide for Educators. Second edition revised and expanded. Paris: Unesco Press, 1981.
Citace podle MLA (9th ed.)A Systems Approach to Teaching and Learning Procedures: A Guide for Educators. Second edition revised and expanded. Unesco Press, 1981.
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