title: Task Difficulty and Noncontingent Reinforcement Schedules as Factors in Self-Reinforcement.
authors.affiliation: a Departments of Psychology , University of Portland and University of Oregon Medical School , USA.
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Dorsey
authors.affiliation: a Departments of Psychology , University of Portland and University of Oregon Medical School , USA.|b University of Cincinnati. , USA.
authors.forename: Frederick H
authors.initials: FH
authors.lastname: Kanfer
authors.affiliation: a Departments of Psychology , University of Portland and University of Oregon Medical School , USA.
authors.forename: Pryse H
authors.initials: PH
authors.lastname: Duerfeldt