MLA
Langdon, Christoph Schlueter and Alexander Hars. "Open Source Software Business Models and Customer Involvement Economics." Software Applications: Concepts, Methodologies, Tools, and Applications. IGI Global, 2009. 1906-1915. Web. 25 Apr. 2018. doi:10.4018/978-1-60566-060-8.ch113
APA
Langdon, C. S., & Hars, A. (2009). Open Source Software Business Models and Customer Involvement Economics. In P. Tiako (Ed.), Software Applications: Concepts, Methodologies, Tools, and Applications (pp. 1906-1915). Hershey, PA: IGI Global. doi:10.4018/978-1-60566-060-8.ch113
Chicago
Langdon, Christoph Schlueter and Alexander Hars. "Open Source Software Business Models and Customer Involvement Economics." In Software Applications: Concepts, Methodologies, Tools, and Applications, ed. Pierre F. Tiako, 1906-1915 (2009), accessed April 25, 2018. doi:10.4018/978-1-60566-060-8.ch113
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