Teaching school mathematics / edited by W. Servais and T. Varga. - Harmondsworth : Penguin, c 1971. - 308 p. : ill. ; 21 cm. - A Unesco source book. . Bibliography : p. 289-298. 301 301 Subjects--Topical Terms: Study and teaching.Mathematics. Dewey Class. No.: 372.7 / U3t