11. Design and analysis: a researcher's handbook Keppel, Geoffrey. Upper Saddle River, NJ : Pearson Education, 2004. CP541 PSY412 PSY402
12. Statistical power analysis for the behavioral sciences Cohen, Jacob, 1923- Hillsdale, N.J. : L. Erlbaum Associates, 1988. CP516 CP541 PSY412 PSY402
