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- [1] MARBLE-SORTING PERSISTENCE IN MIXED VERBAL-INCENTIVE AND PERFORMANCE-LEVEL PAIRINGS AMERICAN JOURNAL OF MENTAL DEFICIENCY, 1967, 71 (05): : 811 - &
- [5] RELATIONSHIPS BETWEEN ACHIEVEMENT-RELATED MOTIVES AND INTELLIGENCE, PERFORMANCE-LEVEL, AND PERSISTENCE JOURNAL OF ABNORMAL AND SOCIAL PSYCHOLOGY, 1964, 68 (05): : 523 - 532
- [6] EFFECTS OF VERBAL-REINFORCEMENT, INTEREST, AND USABLE PERFORMANCE FEEDBACK UPON TASK-PERFORMANCE JOURNAL OF EXPERIMENTAL EDUCATION, 1979, 47 (02): : 144 - 148