By R. Whitlow
By J.M. Patchett
By Vernon John
By C. M. H. Barritt
By Victor Charles Launder
By Clarence Wilson
By T.M. Megaw
By R. Chudley
By K R F Andrews
By Chris Collinson
By Thompson, Silvanus P, Gardner, Martin
By James J. Mcgregor; Alan H. Watt;
By Kennedy, Angus, Rough Guides
By Glenn D. Considine
By Subhash C. Anand, Raj Kumar
By D. W. G. Ballentyne, D. Lovett
By Alan Townshend
By Greene, Brian
By Budden, F.J.
By Neill, Hugh
By School Mathematics Project
By G.W. Jenkins, J.L. Slack, Jenkins, G.W., Slack, J.L.
By Brian Overland
By Ian O. Angell
By Bernard Francis Gray
By Ridpath, Ian, Tirion, Wil
By L.M. Gourd