MLA
O’Gorman, Jack. "Reference Products and Services: Historical Overview and Paradigm Shift." E-Reference Context and Discoverability in Libraries: Issues and Concepts, edited by Sue Polanka, IGI Global, 2012, pp. 1-10. https://doi.org/10.4018/978-1-61350-308-9.ch001
APA
O’Gorman, J. (2012). Reference Products and Services: Historical Overview and Paradigm Shift. In S. Polanka (Ed.), E-Reference Context and Discoverability in Libraries: Issues and Concepts (pp. 1-10). IGI Global. https://doi.org/10.4018/978-1-61350-308-9.ch001
Chicago
O’Gorman, Jack. "Reference Products and Services: Historical Overview and Paradigm Shift." In E-Reference Context and Discoverability in Libraries: Issues and Concepts, edited by Sue Polanka, 1-10. Hershey, PA: IGI Global, 2012. https://doi.org/10.4018/978-1-61350-308-9.ch001
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