लेखक: David Festinger

GEOFFREY MARCZYK, JD, PHD, is Assistant Professor at Widener University”s Institute for Graduate Clinical Psychology in Chester, Pennsylvania. DAVID DEMATTEO, JD, PHD, is a behavioral scientist at the Treatment Research Institute at the University of Pennsylvania in Philadelphia, Pennsylvania. DAVID FESTINGER, PHD, is a behavioral scientist at the Treatment Resarch Institute at the University of Pennsylvania in Philadelphia, Pennsylvania.