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Alle 2 Martin Sundel releases op Paperback Book
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![Cover for Martin Sundel · Behavior Change in the Human Services: Behavioral and Cognitive Principles and Applications (Paperback Book) [6 Revised edition] (2017)](https://imusic.b-cdn.net/images/item/original/610/9781483384610.jpg?martin-sundel-2017-behavior-change-in-the-human-services-behavioral-and-cognitive-principles-and-applications-paperback-book&class=scaled&v=1539665266)
![Cover for Martin Sundel · Individual Change Through Small Groups, 2nd Ed. (Paperback Book) [Revised and Exp edition] (1985)](https://imusic.b-cdn.net/images/item/original/903/9780029117903.jpg?martin-sundel-1985-individual-change-through-small-groups-2nd-ed-paperback-book&class=scaled&v=1481271124)