Will Shadish

Alkin M. C. (2013). Evaluation roots: A wider perspective of theorists’ views and influences (2nd ed.). Thousand Oaks, CA: Sage.

Shadish W. R. Clark M. H. Steiner P. M. (2008). Can nonrandomized experiments yield accurate answers? A randomized experiment comparing random to nonrandom assignment. Journal of the American Statistical Association, 103, 1334–1343.

Shadish W. R. Cook T. D. Campbell D. T. (2002). Experimental and quasi-experimental designs for generalized causal inference. Boston, MA: Houghton Mifflin.

Shadish W. R. Cook T. D. Leviton L. C. (1991). Foundations of program evaluation: Theories of practice. Newbury Park, CA: Sage.