MLA
Graham, Charles R., and Stephanie Allen. "Blended Learning Environments." Encyclopedia of Distance Learning, edited by Caroline Howard, et al., IGI Global, 2005, pp. 172-179. https://doi.org/10.4018/978-1-59140-555-9.ch024
APA
Graham, C. R. & Allen, S. (2005). Blended Learning Environments. In C. Howard, J. Boettcher, L. Justice, K. Schenk, P. Rogers, & G. Berg (Eds.), Encyclopedia of Distance Learning (pp. 172-179). IGI Global Scientific Publishing. https://doi.org/10.4018/978-1-59140-555-9.ch024
Chicago
Graham, Charles R., and Stephanie Allen. "Blended Learning Environments." In Encyclopedia of Distance Learning, edited by Caroline Howard, et al., 172-179. Hershey, PA: IGI Global, 2005. https://doi.org/10.4018/978-1-59140-555-9.ch024
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