Grünberger, Axelle; Kyriazopoylou, Mary; Soriano, Victoria; Þórgunnur Skúladóttir 1951; European Agency for Development in Special Needs Education(Evrópumiðstöðin fyrir þróun í sérkennslu, 2009)
Evrópumiðstöðin fyrir þróun í sérkennslu; European Agency for Development in Special Needs Education(European Agency for Development in Special Needs Education, 2003)