MLA
Langer, Gary R. "21st Century E-Student Services." Encyclopedia of Distance Learning, edited by Caroline Howard, et al., IGI Global, 2005, pp. 1907-1913. https://doi.org/10.4018/978-1-59140-555-9.ch289
APA
Langer, G. R. (2005). 21st Century E-Student Services. In C. Howard, J. Boettcher, L. Justice, K. Schenk, P. Rogers, & G. Berg (Eds.), Encyclopedia of Distance Learning (pp. 1907-1913). IGI Global Scientific Publishing. https://doi.org/10.4018/978-1-59140-555-9.ch289
Chicago
Langer, Gary R. "21st Century E-Student Services." In Encyclopedia of Distance Learning, edited by Caroline Howard, et al., 1907-1913. Hershey, PA: IGI Global, 2005. https://doi.org/10.4018/978-1-59140-555-9.ch289
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