By Franz Mandl, MANDL, Franz
By Hillard, David, Alexander, Serena
By Sarah Lindsay, Lindsay, Sarah
By CGP Books
By Keogh, Brenda, Naylor, Stuart, Mitchell, Ged
By Schofield & Sims, Andrew Parker, Jane Stamford
By E. Cheney, David Kincaid
By School Mathematics Project
By Perl, Teri
By Mulholland, H., Phillips, J.H.G.
By School Mathematics Project, School
By Sherran, Peter, Crawshaw, Janet
By Deborah Rumsey, Rumsey, PhD Deborah J.
By Smullyan, Raymond
By Edmondson, Andrew
By Andrew Edmondson, Edmondson, Andrew
By Singh, Simon
By Kreyszig, Erwin
By T.A., Whitelaw;
By Neill, Hugh, Johnson, Trevor
By Potter, Lawrence
By Jeffreys, Harold, B. S.
By The Mathematical Association
By Jennings, Mick
By McLean, Jean, etc., Sang, David
By Fletcher, Harold
By Mahler, Kurt, Hansen, Henry
By Mumford, Jeanette
By Mumford, Jeanette, Woodward, JoAnne