I need 2 full pages on theTheory on Experimental and Quasi-Experimental Designs
Please provide 2 References.

Course Text:

Green, S. B., & Salkind, N. J. (2008). Using SPSS for Windows and Macintosh: Analyzing and understanding data (5th ed.). Upper Saddle River, NJ: Pearson.

Campbell, D. T., & Stanley, J. (2010). Experimental and quasi-experimental designs for research(Laureate Education, Inc., custom ed.). Mason, OH: Cengage Learning.