Steen, L. A. (1992). Heeding the call for change: Suggestions for curricular action. The Mathematical Association of America.
Cita Chicago (17th ed.)Steen, Lynn Arthur. Heeding the Call for Change: Suggestions for Curricular Action. Washington, D.C: The Mathematical Association of America, 1992.
Cita MLA (9th ed.)Steen, Lynn Arthur. Heeding the Call for Change: Suggestions for Curricular Action. The Mathematical Association of America, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.