TY - BOOK AU - Yelon,Stephen L. TI - Powerful principles of instruction SN - 080131643X AV - LB 1025.3 .Y45 1996 PY - 1996/// CY - White Plains, N.Y. PB - Longman Publishers USA KW - Teaching KW - Learning KW - Teachers N1 - Includes bibliographical references (p. 283-287) and index ER -