%0 Journal Article %T Effects of a Classroom Intervention With Spatial Play Materials on Childrens Object and Viewer Transformation Abilities %A Vander Heyden, Karin M. %A Huizinga, Mariette %A Jolles, Jelle %J Developmental Psychology %V 53 %N 2 %P 290-305 %@ 0012-1649 %D 2017-02-10 %I American Psychological Association %~ DeepDyve