Ganz, J. B., Lund, E. M., & Simpson, R. L. (2012). The Picture Exchange Communication System (PECS): A promising method for improving communication skills of learners with autism spectrum disorders . Education and Training in Autism and Developmental Disabilities , 47 (2), 176–186. http://www.daddcec.com/etadd.html
Ganz, J. B., Lund, E. M., & Simpson, R. L. (2012). The Picture Exchange Communication System (PECS): A promising method for improving communication skills of learners with autism spectrum disorders. Education and Training in Autism and Developmental Disabilities, 47(2), 176–186. http://www.daddcec.com/etadd.html
Notes
[no doi reported]
URL
http://www.daddcec.com/etadd.html