MLA
Tatnall, Arthur. "The Ubiquitous Portal." Encyclopedia of Portal Technologies and Applications, edited by Arthur Tatnall, IGI Global, 2007, pp. 1040-1044. https://doi.org/10.4018/978-1-59140-989-2.ch170
APA
Tatnall, A. (2007). The Ubiquitous Portal. In A. Tatnall (Ed.), Encyclopedia of Portal Technologies and Applications (pp. 1040-1044). IGI Global. https://doi.org/10.4018/978-1-59140-989-2.ch170
Chicago
Tatnall, Arthur. "The Ubiquitous Portal." In Encyclopedia of Portal Technologies and Applications, edited by Arthur Tatnall, 1040-1044. Hershey, PA: IGI Global, 2007. https://doi.org/10.4018/978-1-59140-989-2.ch170
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