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by Knapp, Sarah Edison; Berghuis, David J.; Dimmitt, Catherine L.
by Berghuis, David J.; Knapp, Sarah Edison
by Knapp, Sarah Edison; Berghuis, David J.
by Knapp, Sarah Edison; Jongsma, Arthur E.
by Sarah Edison Knapp (Cline/Fay Institute, Chicago); Arthur E. Jongsma (Psychological Consultants, Grand Rapids, Michigan)