- http://www.uvm.edu/~dhowell/gradstat/psych341/lectures/MultipleRegression/multreg3.html
- MacKinnon, Krull & Lockwood (2002). Equivalence of the Mediation, Confounding and Suppression Effect. Prevention Science, Vol. 1, No. 4, 173-181.
- Friedman, Lynn and Melanie Wall (2005), "Graphical Views of Suppression and Multicollinearity in Multiple Linear Regression," The American Statistician, 59 (2), 127-136.
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