1. When are pleasant words learned faster than unpleasant words?;Anisfeld;Journal of Verbal Learning & Verbal Behavior,1966
2. Priority of free recall of newly learned items;Battig;Journal of Verbal Learning & Verbal Behavior,1965
3. The psychology of pleasantness and unpleasantness;Beebe-Center,1932
4. Arousal and reinforcement;Berlyne,1967
5. Aesthetics and psychobiology;Berlyne,1971