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APA Citation
Couper, L., van der Meer, L., Schäfer, M. C. M., McKenzie, E., McLay, L., O'Reilly, M. F., Lancioni, G. E., Marschik, P. B., Sigafoos, J., & Sutherland, D. (n.d.). comparing acquisition of and preference for manual signs, picture exchange, and speech-generating devices in nine children with autism spectrum disorder. Developmental neurorehabilitation, 17, 99–109. http://access.bl.uk/ark:/81055/vdc_100024971081.0x00005e