MLA
Sigel, Alexander, and Khalil Ahmed. "Topic-Oriented Portals." Encyclopedia of Portal Technologies and Applications, edited by Arthur Tatnall, IGI Global, 2007, pp. 1020-1025. https://doi.org/10.4018/978-1-59140-989-2.ch167
APA
Sigel, A. & Ahmed, K. (2007). Topic-Oriented Portals. In A. Tatnall (Ed.), Encyclopedia of Portal Technologies and Applications (pp. 1020-1025). IGI Global. https://doi.org/10.4018/978-1-59140-989-2.ch167
Chicago
Sigel, Alexander, and Khalil Ahmed. "Topic-Oriented Portals." In Encyclopedia of Portal Technologies and Applications, edited by Arthur Tatnall, 1020-1025. Hershey, PA: IGI Global, 2007. https://doi.org/10.4018/978-1-59140-989-2.ch167
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