MLA
Gelman, Ovsei,et al. "Information Systems and Systems Theory." Encyclopedia of Information Science and Technology, First Edition, edited by Mehdi Khosrow-Pour, D.B.A., IGI Global, 2005, pp. 1491-1496. http://doi:10.4018/978-1-59140-553-5.ch262
APA
Gelman, O., Mora, M., Forgionne, G., & Cervantes, F. (2005). Information Systems and Systems Theory. In Khosrow-Pour, D.B.A., M. (Ed.), Encyclopedia of Information Science and Technology, First Edition (pp. 1491-1496). IGI Global. http://doi:10.4018/978-1-59140-553-5.ch262
Chicago
Gelman, Ovsei and Manuel Mora, Guisseppi Forgionne, and Francisco Cervantes. "Information Systems and Systems Theory." In Encyclopedia of Information Science and Technology, First Edition. edited by Mehdi Khosrow-Pour, D.B.A., 1491-1496. Hershey, PA: IGI Global, 2005. http://doi:10.4018/978-1-59140-553-5.ch262
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