By Stewart, Ian, Barnsley, Prof. Michael, Lesmoir-Gordon, Nigel, Mandelbrot, Benoit B., Flake, Dr. Gary, Prechter, Robert R., Clarke, Arthur C.
By Pekar, Harvey, Crumb, Robert R.
By Kirby, Robert R., Taylor, Robert W., Civetta, Joseph M.
By Mccammon, Robert R.
By Leka, Stavroula, Sinclair, Robert R., Houdmont, Jonathan
By Palmer, Robert R.
By Paddleford, Robert R.
By Frost, A.J., Prechter, Robert R.
By Blake Ph.D., Robert R., Adams McCanse, Anne
By Reeder, Robert R., etc., Brierty, Edward S., Reeder, Betty H.
By Carkhuff Ph.D., Robert R., Benoit M.Ed., Donald M.
By Lauwerys, Robert R.
By Kuzdrall, Paul J., Britney, Robert R.
By Zall, Robert R.
By Wilkinson, Philip, Ingpen, Robert R.
By Alford, Robert R.
By Pagano, Robert R.
By Blake, Robert R., Mouton, Jane S., Jane Srygley Mouton