Buzan, Tony, Use Both Sides of Your Brain (New York: Dutton, 1974.) Costa, Arthur, Developing Minds (ASCD, 1985)
"New Horizons for Learning: An International Human Resource Network" (Now an online organization, no longer a membership organization-- our newsletter is free at our website. If you are interested in contacting them please write to: New Horizons for Learning, PO box 15329, Seattle, WA 98115-0329 or Phone: (206) 547-7936.)
Rico, Gabriele, Writing the Natural Way (Los Angeles: J. P. Tarcher, Inc., 1983.)