By McDonald, J. I. H.
By Carter, Ronald
By Mulligan, WILLIAM
By Richardson, Paul
By Pike, Douglas
By Kravitz
By Puchta, Herbert, Stranks, Jeff, Lewis-Jones, Peter
By School Mathematics Project
By Tunica, Nikki
By Paterson-Brown, Sara
By Fillenz, Marianne
By Roberts, Alan
By Powis, David A.
By Ryall, R. W.
By Page, Brian
By Cambers, Gary, Sibley, Steve
By Symonds, Pamela
By Bernard, Philippe, DUBIEF, Henri, Forster, Thony
By Lowrie, WILLIAM
By Mussett, Alan E., Khan, M. Aftab, Button, Sue
By Beatty, J. Kelly, Petersen, Carolyn Collins, Chaikin, Andrew
By Glass, Billy P.
By Plant, Raymond
By Aust, Anthony
By Brown, Richard
By Robert S. Levine
By Leggatt, Alexander
By Johnson, Claudia L.
By Swallow
By Krueger