Ruskin, R. S. (1974). The personalized system of instruction: An educational alternative. American Association for Higher Education.
Citace podle Chicago (17th ed.)Ruskin, Robert S. The Personalized System of Instruction: An Educational Alternative. Washington: American Association for Higher Education, 1974.
Citace podle MLA (8th ed.)Ruskin, Robert S. The Personalized System of Instruction: An Educational Alternative. American Association for Higher Education, 1974.
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