Egleston, Brian L. "Response to Pearl's Comments on Principal Stratification" The International Journal of Biostatistics, 7.1 (2011): 1-3. Retrieved 18 May. 2013, from doi:10.2202/1557-4679.1330

Egleston, B. (2011). Response to Pearl's Comments on Principal Stratification. The International Journal of Biostatistics, 7(1), pp. 1-38. Retrieved 18 May. 2013, from doi:10.2202/1557-4679.1330

Egleston, Brian L. 2011. Response to Pearl's Comments on Principal Stratification. The International Journal of Biostatistics. 7(1): 1-38. Retrieved 18 May. 2013, from doi:10.2202/1557-4679.1330