Engels, E. A., Pfeiffer, R. M., Ricker, W., Wheeler, W., Parsons, R., & Warren, J. L. (2011). Use of Surveillance, Epidemiology, and End Results-Medicare Data to Conduct Case-Control Studies of Cancer Among the US Elderly. Oxford University Press.

Engels, Eric A., Ruth M. Pfeiffer, Winnie Ricker, William Wheeler, Ruth Parsons, و Joan L. Warren. Use of Surveillance, Epidemiology, and End Results-Medicare Data to Conduct Case-Control Studies of Cancer Among the US Elderly. Oxford University Press, 2011.

Engels, Eric A., et al. Use of Surveillance, Epidemiology, and End Results-Medicare Data to Conduct Case-Control Studies of Cancer Among the US Elderly. Oxford University Press, 2011.