 How People Change (Paperback) by Tim Lane and Paul David Tripp PTC 522: 100% $17.99 $12.05 |  How People Change (Study Guide) (5 Pack) (Paperback) by Timothy S. Lane; Tripp, Paul David $99.99 $79.99 |  How People Change (Study Guide) (Paperback) by Lane, Timothy S.; Tripp, Paul David $19.99 $16.99 |  How People Change (Facilitator's Guide) (Paperback) by Lane, Timothy S.; Tripp, Paul David $24.99 $18.74 |