Willoughby, S. S. (1990). Mathematics education for a changing world. ASCD.
Lua i Stíl Chicago (17ú heag.)Willoughby, Stephen S. Mathematics Education for a Changing World. Alexandria: ASCD, 1990.
Lua MLA (9ú heag.)Willoughby, Stephen S. Mathematics Education for a Changing World. ASCD, 1990.
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