TY  - JOUR
TI  - SPSS and SAS procedures for estimating indirect effects in simple mediation models
AU  - Kristopher J. Preacher
AU  - Andrew F. Hayes
PY  - 2004
JO  - Behavior Research Methods, Instruments, & Computers
DO  - 10.3758/bf03206553
UR  - https://doi.org/10.3758/bf03206553
ER  -