Lee, Ju-young, and Katrina McFerran. “The Improvement of Non-Verbal Communication Skills of Five Females With Profound and Multiple Disabilities Using Song-Choices in Music Therapy”. Voices: A World Forum for Music Therapy 12, no. 3 (September 17, 2012). Accessed April 25, 2024. https://voices.no/index.php/voices/article/view/1996.