MLA
Ehlers, Ulf-Daniel. "European Quality Observatory." Encyclopedia of Portal Technologies and Applications, edited by Arthur Tatnall, IGI Global, 2007, pp. 368-375. https://doi.org/10.4018/978-1-59140-989-2.ch063
APA
Ehlers, U. (2007). European Quality Observatory. In A. Tatnall (Ed.), Encyclopedia of Portal Technologies and Applications (pp. 368-375). IGI Global Scientific Publishing. https://doi.org/10.4018/978-1-59140-989-2.ch063
Chicago
Ehlers, Ulf-Daniel. "European Quality Observatory." In Encyclopedia of Portal Technologies and Applications, edited by Arthur Tatnall, 368-375. Hershey, PA: IGI Global, 2007. https://doi.org/10.4018/978-1-59140-989-2.ch063
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