Riedesel, C. Alan Guiding discovery in elementary school mathematics / C. Alan Riedesel - 2nd ed. - Englewood Cliffs, N.J. : Prentice-Hall, 1973 - 657 p. : ill. ; 25 cm. Includes bibliographical references ISBN: 0133715833 LCCN: 73-14078 Subjects--Topical Terms: Mathematics--Study and teaching (Elementary)