(2012). Number activities for children with mathematical learning difficulties / Mel Lever. [electronic resource].
Chicago-Zitierstil (17. Ausg.)Number Activities for Children with Mathematical Learning Difficulties / Mel Lever. [electronic Resource]. 2012.
MLA-Zitierstil (9. Ausg.)Number Activities for Children with Mathematical Learning Difficulties / Mel Lever. [electronic Resource]. 2012.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.