Schedules of reinforcement - Ferster, C. B.; Skinner, Burrhus Frederic 1904-. (New York Appleton-Century-Crofts, 1957)
"Most of the work ... was carried out under contract to the Office of Naval Research under Contracts No. N5ori-07631 and N5ori-07656 with Harvard University ... between September 1, 1949 and June 30, 1955."
Keywords: Reinforcement (Psychology)