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Singer, J., & Willett, J. (2003-05-08).  (Ed.), Applied Longitudinal Data Analysis: Modeling Change and Event Occurrence. : Oxford University Press,. Retrieved 15 Feb. 2019, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195152968.001.0001/acprof-9780195152968.