TY - BOOK ED - National Council of Teachers of Mathematics. TI - Professional standards for teaching mathematics SN - 0873533070 : AV - QA11 .N29 1991 U1 - 510.71PRO 20 PY - 1991/// CY - Reston, VA PB - The Council KW - Mathematics KW - Study and teaching KW - Standards N1 - "March 1991."; Includes bibliographical references (p. 195-196) ER -