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Harlow, Ralph. Samuel Adams. New York: Henry Holt and Company, 1928.
Ralph Harlow's Book "Samuel Adams"
Davis, R. T., Settlage, P. H., & Harlow, H. F. (1950). Performance of normal and brain-operated monkeys on mechanical puzzles with and without food incentives. Journal of Genetic Psychology, 7, 305-311.
Extrinsic Motivation in Education
Abbs, B., Freebairn, I., (1982). Studying Strategies Students* Book. Harlow: Longman
TESOL Teaching Material
Alexander, L. G., (1988). Longman English Grammar. Harlow: Longman.
TESOL Teaching Material
Cunningham, S., Moor, P., (2001). Cutting Edge Pre-Intermediate. Harlow: Longman
TESOL Teaching Material
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