References:
SPSS and SAS Procedures for Estimating Indirect Effects in Simple Mediation Models
36(4), 717-731 (by Preacher, K.J. & Hayes, A.F. (2004))
Journal: Behavior Research Methods
Asymptotic and Resampling Strategies for Assessing and Comparing Indirect Effects in Multiple Mediator Models
40(3), 879 – 891 (by Preacher, K.J. & Hayes, A.F. (2008))
Journal: Behavior Research Methods
