By Alison Sealey
By Jan Hawkins
By Richard De Mille
By Julian Sleigh
By Jane Healy
By L. S. Vygotsky, Michael Cole, Vera John-Steiner, Sylvia Scribner, Ellen Souberman
By Kate Collins-Donnelly
By Paula Crimmens
By Richard Bryant-Jefferies (Retired BACP Accredited Person-Centred Counsellor and Supervisor, UK)
By Gillian Schofield, Mary Beek
By Glenda Fredman
By Sue Gerhardt (Private Practice, Oxford, UK)
By Clive Dorman, Helen Georgina Dorman
By Sean Covey
By Deb Dana, Stephen W. Porges (University of North Carolina)
By Gill Lane, David Clutterbuck
By Jan Sutton, William Stewart
By Cathy Nutbrown
By Suniya S. Luthar (Columbia University, New York)
By Michael White
By Dallos, Rudi
By Vera Fahlberg
By Ian Stewart
By Steve Andreas, Connirae Andreas
By John Sants, H.J. Butcher
By Ross Vasta, etc., Marshall Haith (University of Denver, Colorado, USA), Scott Miller (University of Florida
By Matthew Syed, Toby Triumph
By Philip Burnard, jo campling
By Erikson, E H
By Cathy Glass