By Kim Heacox
By A. O'Malley
By Thompson, Silvanus P., Robert, Tim
By M. Bleeker
By Jenifer W Day
By Gero von Boehm
By Ralph Leighton
By George A. Miller
By Owen Flanagan (Duke University)
By David Joseph Weeks, Jamie James
By Benjamin Franklin
By Martin, Jean; Milner, Bryan
By Donald R Lehmann
By Alan Townshend
By Solutions 2nd
By David Hall
By Bruce Fogle
By Stuart R. Schram
By Jeremy Kilpatrick, Jane Swafford, Bradford Findell, Mathematics Learning Study Committee, National Research Council
By Alison Jolly, Hilary Bradt, Margaretta Jolly
By Patrick Wilcken
By Wendy James, N. J. Allen
By Stephen Gaukroger (University of Sydney)
By diana webster, Victoria Webster
By Smith, Mr Harry
By Nagle, Garrett, Spencer, Kris, Garrett Nagle, Kris Spencer
By Mr Martin Kemp
By Delmas, Anais