Merttens, Ruth. Sharing maths cultures : IMPACT, Inventing Maths for Parents and Children and Teachers / Ruth Merttens, Jeff Vass. - Basingstroke, Hampshire, UK ; Bristol, PA : Falmer Press, 1990. - 195 p. : ill. ; 25 cm. Includes bibliographical references (p. 193-195). ISBN: 1850008752 : £20.00 (est.) 1850008760 (pbk.) : £9.95 (est.) Subjects--Topical Terms: Mathematics--Study and teaching--Great Britain.IMPACT (Project) Dewey Class. No.: 510.71041 / MER