Motivational Interviewing in Groups by Christopher C. Wagner & Karen S. Ingersoll New York, Guilford Press, 2013, 416 pp, ISBN 978-1-4625-0792-4 Read article here: Motivational Interviewing in Groups by Christopher C. Wagner & Karen S. Ingersoll New York, Guilford Press, 2013, 416 pp, ISBN 978-1-4625-0792-4