Feil, Naomi, 
The validation breakthrough :  simple techniques for communicating with people with Alzheimer's and other dementias /  by Naomi Feil, M.S.W., A.C.S.W. and Vicki de Klerk-Rubin, R.N., M.B.A. ; foreword by David Nilson.   - Third edition.   - Baltimore :  Health Professions Press,  2012.   - xxxiii, 294 pages :  illustrations (black and white) ;  23 cm