TY - JOUR A1 - Heckhausen, H. A1 - Gollwitzer, P.M. T1 - Thought Contents and Cognitive Functioning in Motivational versus Volitional States of Mind Y1 - 1987 DO - 10.1007/BF00992338 JF - Motivation and Emotion VL - 11 IS - 2 ER -