By Jay, Ros
By Jack Forem
By Spencer Roberts
By Bangs Tapscott
By Ken Blanchard
By Hughes, Edward, McKenzie-Smith, Ian, Hiley, Dr John, Brown, Dr Keith
By Hollingsworth
By Ian Jacques
By Louis Kriesberg
By Munroe K. Spears
By Horstmann, Cay S., Cornell, Gary
By Baker, Art
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By Nick Brieger, Simon Sweeney
By Comfort, Jeremy, Brieger, Nick
By Joseph H Pleck, Richard Headstrom
By John Storey
By Carl R. Rogers, H. Jerome Freiberg (both of University of Houston, Texas, USA)
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By Lynne Hunter
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By Sytse Douma, Hein Schreuder
By Ann Fisher
By Judith Wechsler
By Catrin Brown, Mike Ford
By Peter Coad, Mark Mayfield, Jon Kern