Seckinger, D. S. (1975). A problem approach to foundations of education. John Wiley.
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Chicago-čujuhus (17. p.)
Seckinger, Donald S. A Problem Approach to Foundations of Education. New York: John Wiley, 1975.
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MLA-čujuhus (9. p.)
Seckinger, Donald S. A Problem Approach to Foundations of Education. John Wiley, 1975.
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