MLA
Langdon, Christoph Schlueter, and Alexander Bau. "Portal Economics and Business Models." Encyclopedia of Portal Technologies and Applications, edited by Arthur Tatnall, IGI Global, 2007, pp. 719-723. https://doi.org/10.4018/978-1-59140-989-2.ch119
APA
Langdon, C. S. & Bau, A. (2007). Portal Economics and Business Models. In A. Tatnall (Ed.), Encyclopedia of Portal Technologies and Applications (pp. 719-723). IGI Global. https://doi.org/10.4018/978-1-59140-989-2.ch119
Chicago
Langdon, Christoph Schlueter, and Alexander Bau. "Portal Economics and Business Models." In Encyclopedia of Portal Technologies and Applications, edited by Arthur Tatnall, 719-723. Hershey, PA: IGI Global, 2007. https://doi.org/10.4018/978-1-59140-989-2.ch119
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