By Carl Bamford, Paul Curran
By Rossi, Peter H., Freeman, Howard E., Lipsey, Mark W.
By Alan Townshend
By Barry S. Lee
By Heathcote, Pat M.
By Ned Snell
By Richard Belfield
By Kennedy, Angus, Rough Guides
By Glenn D. Considine
By Subhash C. Anand, Raj Kumar
By D. W. G. Ballentyne, D. Lovett
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 James J. Mcgregor; Alan H. Watt;
By Colin J. Theaker, Graham R. Brookes
By Dean Scharf
By A. J. Sadler, D. W. S. Thorning
By Fox, Mike, Smith, Steve
By Unknown
By Theodore R. Anderson, Morris Zelditch
By Pollard, A.B., Schofield, C.W.
By L.M. Gourd