MLA
Halpin, Terry. "Enriched Conceptualization of Subtyping." Innovations in Information Systems Modeling: Methods and Best Practices. IGI Global, 2009. 1-16. Web. 10 Dec. 2019. doi:10.4018/978-1-60566-278-7.ch001
APA
Halpin, T. (2009). Enriched Conceptualization of Subtyping. In T. Halpin, J. Krogstie, & E. Proper (Eds.), Innovations in Information Systems Modeling: Methods and Best Practices (pp. 1-16). Hershey, PA: IGI Global. doi:10.4018/978-1-60566-278-7.ch001
Chicago
Halpin, Terry. "Enriched Conceptualization of Subtyping." In Innovations in Information Systems Modeling: Methods and Best Practices, ed. Terry Halpin, John Krogstie and Erik Proper, 1-16 (2009), accessed December 10, 2019. doi:10.4018/978-1-60566-278-7.ch001
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