Barker, Philip J. 
The tidal model :  a guide for mental health professionals /  Philip J. Barker and Poppy Buchanan-Barker ; foreword by Sally Clay and Irene Whitehill.   - 1st ed.   - New York ;  Hove :  Brunner-Routledge,  2004.   - 248 p. :  ill. ;  24 cm.