The following references can be used to cite this sobel test calculator for the significance of mediation:

| Soper, D.S. (2014). Sobel Test Calculator for the Significance of Mediation [Software]. Available from http://www.danielsoper.com/statcalc |

| Sobel, M. E. (1982). Asymptotic confidence intervals for indirect effects in structural equation models. Sociological Methodology, Vol. 13, pp. 290-312. |