Media type: E-Article Title: Effects of a classroom intervention with spatial play materials on children’s object and viewer transformation abilities Contributor: Vander Heyden, Karin M.; Huizinga, Mariette; Jolles, Jelle Published: American Psychological Association (APA), 2017 Published in: Developmental Psychology, 53 (2017) 2, Seite 290-305 Language: English DOI: 10.1037/dev0000224 ISSN: 1939-0599; 0012-1649 Origination: Footnote: