Biggs, Edith Ethel. Freedom to learn an active learning approach to mathematics. Authors: Edith E. Biggs [and] James R. MacLean. - Don Mills, Ont. Reading, Mass. Addison-Wesley (Canada) Ltd. [c1969] - 205 p. illus. (part col.) 25 cm. LCCN: 76079566 //r92 Nat. Bib. No.: C*** Subjects--Topical Terms: Mathematics--Study and teaching.Active learning LC Class. No.: QA11 / .B5 Dewey Class. No.: 507/.1