1. The effect of effort and performance reinforcement on the WISC-R scores of black and white EMR boys;Tufano,1975
2. Bersoff, D. Personal Communication, April 1973.
3. Experimenter role effects on children's task performance and perception;Allen;Child Development,1969
4. Psychological testing;Anastasi,1954
5. Pitfalls in research: Nine investigator and experimenter effects;Barber,1973