Willoughby, S. S. (1990). Mathematics education for a changing world. ASCD.
Cita Chicago (17th ed.)Willoughby, Stephen S. Mathematics Education for a Changing World. Alexandria: ASCD, 1990.
Cita MLA (9th ed.)Willoughby, Stephen S. Mathematics Education for a Changing World. ASCD, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.