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\bibitem{Choi_etal2004} Choi, A., Kumar, V., Liou, W., \& Groeneboer, C. (2004). An Integrated Cost Model for Blended Learning Environments. In L. Cantoni, \& C. McLoughlin (Eds.), (pp. 1012--1019). The World Conference on Educational Multimedia, Hypermedia and Telecommunications. Chesapeake, VA: AACE.

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