Gevarter, C., O’Reilly, M. F., Rojeski, L., Sammarco, N., Lang, R., Lancioni, G. E., & Sigafoos, J. (2013). Comparing communication systems for individuals with developmental disabilities: A review of single-case research studies . Research in Developmental Disabilities , 34 (12), 4415–4432. https://doi.org/10.1016/j.ridd.2013.09.017
Gevarter, C., O’Reilly, M. F., Rojeski, L., Sammarco, N., Lang, R., Lancioni, G. E., & Sigafoos, J. (2013). Comparing communication systems for individuals with developmental disabilities: A review of single-case research studies. Research in Developmental Disabilities, 34(12), 4415–4432. https://doi.org/10.1016/j.ridd.2013.09.017
URL
http://www.sciencedirect.com.ezp3.lib.umn.edu/science/journal/08914222/34/12