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APA Citation
Bouck, E. C., Park, J., Sprick, J., Shurr, J., Bassette, L., & Whorley, A. (n.d.). using the virtual-abstract instructional sequence to teach addition of fractions. Research in developmental disabilities, 70, 163–174. http://access.bl.uk/ark:/81055/vdc_100050625720.0x00002c