The following references can be used to cite this sobel test calculator for the significance of mediation:
 | Soper, D.S. (2012) "Sobel Test Calculator for the Significance of Mediation (Online Software)", http://www.danielsoper.com/statcalc3. |
 | Sobel, M. E. (1982) "Asymptotic confidence intervals for indirect effects in structural equation models", Sociological Methodology, Vol. 13, pp. 290-312. |