Sybilla Beckmann Gwendolyn M. Lloyd Thomas J. Cooney books & textbook
Developing Essential Understanding of Functions for Teaching Mathematics in Grades 9-12 by Thomas J. Cooney, Sybilla Beckmann, Gwendolyn M. Lloyd (2010) Paperback
Sybilla Beckmann Gwendolyn M. Lloyd Thomas J. Cooney
National Council of Teachers of Mathematics, 2010 / Paperback