By Barnes, David J., Kolling, Michael
By Harrison, J. A., Alan
By Rappaport, Theodore S.
By Couch, Leon W.
By Gelber, Stan
By Wood, Prof Chris
By Kano, K.
By Saville-Troike, Muriel
By Francesca Taylor
By Donaldson
By H W Janson
By Robert Judd Sickels
By Jon William Toigo
By Carl R. Rogers, H. Jerome Freiberg (both of University of Houston, Texas, USA)
By John Storey
By Judith Wechsler
By Buber
By Gerry Johnson, Kevan Scholes
By Nimal Nissanke
By Thomas Erl
By David Barnes, Michael Kolling
By Robert Slater
By John D. Lenk
By Fred I. Greenstein
By Nelson W. Polsby
By Munroe K. Spears
By Christian Huitema
By Baker, Art
By Horstmann, Cay S., Cornell, Gary
By Tom Furniss, Michael Bath