M. P. Bishop, S. Thomas Elder, and Robert G. Heath Attempted control of operant behavior in man with intracranial self-stimulation incollectionAttempted control of operant behavior in man with intracranial self-stimulationM. P. Bishop, S. Thomas Elder, and Robert G. HeathIn Robert G. Heath (ed.) The Role of Pleasure in Behavior, New York, 1964, pp. 55–81