MLA
Kreeb, Martin, et al. "Web Portals: A Tool for Environmental Management." Information Systems for Sustainable Development, edited by Lorenz M. Hilty, et al., IGI Global, 2005, pp. 213-228. https://doi.org/10.4018/978-1-59140-342-5.ch013
APA
Kreeb, M., Schulz, W., Vosseler, C., Krcmar, H., & Rudel, A. (2005). Web Portals: A Tool for Environmental Management. In L. Hilty, E. Seifert, & R. Treibert (Eds.), Information Systems for Sustainable Development (pp. 213-228). IGI Global. https://doi.org/10.4018/978-1-59140-342-5.ch013
Chicago
Kreeb, Martin, et al. "Web Portals: A Tool for Environmental Management." In Information Systems for Sustainable Development, edited by Lorenz M. Hilty, Eberhard K. Seifert, and Rene Treibert, 213-228. Hershey, PA: IGI Global, 2005. https://doi.org/10.4018/978-1-59140-342-5.ch013
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