By Patilla, Peter, Asher, Kirsty
By Pearce, Stephen
By Carstensen, Bendix
By Everitt, Brian S., Palmer, Christopher R., Horton, Robert
By Cox, D.R., Reid, Nancy
By Anne M.R. Agur, Arthur Dailey
By Saferstein, Richard
By Paul Heiney
By Cloke, Rene, R.
By Wilkes, Angela
By Hoskin, Michael
By Mabberley, D. J.
By Myers, H.P.
By Ousby, Ian.
By School Mathematics Project
By Noel M. Morris
By Keith Brindley
By Anthony C. Fischer-Cripps (Fischer-Cripps Laboratories Pty Ltd, Sydney, Australia)
By John G. Kemeny, Thomas E. Kurtz
By Collins GCSE
By C. Avgerou, G. Lanzara, L. Willcocks
By Willcocks, Leslie P.
By M. Lacity, L. Willcocks
By John L. Phillips
By John Bird (Defence College of Technical Training, UK)
By Morton Hunt
By Desmond Morris
By P. G. Drazin (University of Bristol)
By William P. Richardson
By Edmund Garnweidner