MLA
Puustjarvi, Juha and Pa¨ivi Poyry. "Information Retrieval in Virtual Universities." Virtual Technologies: Concepts, Methodologies, Tools, and Applications, edited by Jerzy Kisielnicki, IGI Global, 2008, pp. 555-566. http://doi:10.4018/978-1-59904-955-7.ch033
APA
Puustjarvi, J., & Poyry, P. (2008). Information Retrieval in Virtual Universities. In Kisielnicki, J. (Ed.), Virtual Technologies: Concepts, Methodologies, Tools, and Applications (pp. 555-566). IGI Global. http://doi:10.4018/978-1-59904-955-7.ch033
Chicago
Puustjarvi, Juha, and Pa¨ivi Poyry. "Information Retrieval in Virtual Universities." In Virtual Technologies: Concepts, Methodologies, Tools, and Applications. edited by Jerzy Kisielnicki, 555-566. Hershey, PA: IGI Global, 2008. http://doi:10.4018/978-1-59904-955-7.ch033
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