SMS dit: Contingency management in education & other equally exciting places : or [I've got blisters on my soul and other equally exciting places / writing: Richard W. Malott; art & ghost writing: Pat Hartlep; art: Stuart Hartlep; caligraphy: Patience Vaughn; photography; James E. Smith; copy editing; Robert Ludlow; educational technology; Dan Reese and Dick Wolfenden].