The following references can be used to cite this post-hoc statistical power calculator for hierarchical multiple regression:

| Soper, D.S. (2015). Post-hoc Statistical Power Calculator for Hierarchical Multiple Regression [Software]. Available from http://www.danielsoper.com/statcalc |

| Abramowitz, M. and Stegun, I.A., eds. (1965). Handbook of Mathematical Functions. New York, NY: Dover. |

| Cohen, J. (1988). Statistical Power Analysis for the Behavioral Sciences (2nd Edition). Hillsdale, NJ: Lawrence Earlbaum Associates. |

| Cohen, J., Cohen, P., West, S.G., and Aiken, L.S. (2003). Applied Multiple Regression/Correlation Analysis for the Behavioral Sciences (3rd edition). Mahwah, NJ: Lawrence Earlbaum Associates. |

| Raudenbush, S. and Bryk, A. (2002). Hierarchical Linear Models (Second Edition). Thousand Oaks, CA: Sage Publications. |