Willoughby, S. S. (1990). Mathematics education for a changing world. ASCD.
Chicago-čujuhus (17. p.)Willoughby, Stephen S. Mathematics Education for a Changing World. Alexandria: ASCD, 1990.
MLA-čujuhus (9. p.)Willoughby, Stephen S. Mathematics Education for a Changing World. ASCD, 1990.
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