Reviews : A Defense of Quasi-Experiments: A Review of L. Mohr's Impact Analysis for Program Evaluation,2nd edn

Bryk, A.S. and S.W. Raudenbush (1992) Hierarchical Linear Models: Applications and Data Analysis Methods. Newbury Park, CA : Sage.

Einhorn, H.J. and R.M. Hogarth (1986) 'Judging Probable Cause', Psychological Bulletin 99(1): 3-19.

Holland, P.W. (1986) 'Statistics and Causal Inference', Journal of the American Statistical Association 81: 945-70.

Mark, M.M. (1990) 'From Program Theory to Tests of Program Theory' , in L. Bickman (ed.) Advances in Program Theory (New Directions for Program Evaluation , no. 47). San Francisco, CA: Jossey Bass.

Reichardt, C.S. and M.M. Mark (in press) 'Quasi-experiments' in L. Bickman and D. Rog (eds) Handbook of Applied Social Research. Newbury Park, CA: Sage.

Rosenbaum, P.R. (1995) Observational Studies. New York : Springer-Verlag.

Stromsdorfer, E. W. and G. Farkas , eds (1980) Evaluation Studies Review Annual, Vol. 5. Newbury Park, CA: Sage.