©2013 National Research Council of Thailand
Chutiwan Kaewsai. 2004. Learning performance of mentally retarded children by using symbols in augmentative and alternative communication system. Field of Study Communication Disorders, Mahidol University;
Chutiwan Kaewsai. (2004) Learning performance of mentally retarded children by using symbols in augmentative and alternative communication system . Mahidol University/Bangkok.
Chutiwan Kaewsai. Learning performance of mentally retarded children by using symbols in augmentative and alternative communication system. . Bangkok:Mahidol University, 2004.
Chutiwan Kaewsai. (2004) Learning performance of mentally retarded children by using symbols in augmentative and alternative communication system . Mahidol University/Bangkok.