Contingency Management in Education Unstated
1973. 4th Printing. Unpaginated. Paperback book with pictorial cover. Black and white illustrations throughout. Binding remains firm. Pages and illustrations have light tanning and foxing throughout. Small tears to some page edges, text remains unaffected. Paper cover has moderate edgewear with small tears and creasing. Slight curling to corners. Light tanning to spine and edges. Sticker and residue to front cover.