By Fenna, Donald
By Singh, Simon
By Nuffield Foundation
By Fannon, Paul, Ward, Stephen
By Richardson, Peter
By Snape, Charles, Scott, Heather
By Julius, Edward H.
By Crowell, R. H., Fox
By Kent County Council
By Cambridge University Press, School Mathematics Project
By Broadbent, Paul
By School Mathematics Project
By Asimov, Isaac
By Vickers, K. M., Tipler, M. J.
By Unknown
By Brace, Alan
By Hogben, Lancelot
By Johnson, David C., etc., Hart Kathleen, Brown, Margaret, Dickson, Linda, Clarkson, Rod
By Pomeroi, Sue De, Tom Button, Catherine Berry, Sue De Pomeroi, Diana Boynova
By Milne, Pat