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1. https://www.mdrc.org/sites/default/files/full_249.pdf

2. Causal Effects in Nonexperimental Studies: Reevaluating the Evaluation of Training Programs

3. The Adequacy of Comparison Group Designs for Evaluations of Employment-Related Programs

4. Can Nonexperimental Comparison Group Methods Match the Findings from a Random Assignment Evaluation of Mandatory Welfare-to-Work Programs? MDRC Working Papers on Research Methodology

5. Clustered Environments and Randomized Genes: A Fundamental Distinction between Conventional and Genetic Epidemiology

6. Nonexperimental Replications of Social Experiments: A Systematic Review

7. Comparison of Evidence of Treatment Effects in Randomized and Nonrandomized Studies

8. The unpredictability paradox: review of empirical comparisons of randomized and non-randomized clinical trials

9. Interpreting the evidence: choosing between randomized and non-randomized studies

10. Wikipedia Bibliography:

    1. Reproducibility

    2. https://en.wikipedia.org/wiki/MDRC  :

       https://en.wikipedia.org/wiki/MDRC

    3. Design of experiments

    4. Difference in differences

    5. Statistical-significance