Singer, J. D., & Willett, J. B. (2003). Applied longitudinal data analysis: Modeling change and event occurrence. Oxford University Press.

Singer, Judith D., and John B. Willett. Applied Longitudinal Data Analysis: Modeling Change and Event Occurrence. Oxford ; New York: Oxford University Press, 2003.

Singer, Judith D., and John B. Willett. Applied Longitudinal Data Analysis: Modeling Change and Event Occurrence. Oxford University Press, 2003.