By Nobus, Dany, Quinn, Malcolm
By Ross Skelton
By Digby Tantam
By Worden, J. William
By Martin, G. Neil
By Levinson, Daniel J
By Mahler, Margaret S.
By American Psychiatric Association
By Brownell, Kelly D., Walsh, B. Timothy
By Maisto, Steven a., Galizio, Mark, Connors, Gerard J.
By Forshaw, Mark
By Colman, Andrew M.
By L. Wright, E.
By Nigel Benson, Piero
By Fontana, David
By Janda, Louis
By Cara Flanagan, Matt Jarvis, Rob Liddle
By James Mann, Robert Goldman
By World Health Organization(WHO)
By Edward F. Edinger, J.Gary Sparks
By Neville Symington
By Dr Anthony Attwood
By Lucy Huskinson (University of Bangor, Wales, UK)
By Bobby Duffy
By Willey, Liane Holliday
By Jane Ogden
By Adelheid A. M. Nicol, Penny M. Pexman
By Joseph H. Smith (Washington School of Psychiatry), William Kerrigan (University of Massachusetts)
By Storr, Anthony