By Charles David Miller, Vern E. Heeren, E. John Hornsby
By G.J. Whitrow
By Graham W. Owens, Brian D. Cheal
By Twilt, Hass, Klingsch, Edwards, Dutta
By D. A. Nethercot
By Raymond J. Roark, Warren C. Young
By Packer, Wardenier, Kurobane, Dutta, Yeomans
By Wardenier, Kurobane, Packer, Dutta, Yeomans
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By Rondal, Wuerker, Dutta, Wardenier, Yeomans
By Higgins, Raymond A.
By John W. Fisher, Jr., John H.A. Struik, Geoffrey L. Kulak, G. Kulak Canada
By Charles G Salmon, John E Johnson, J.D
By Frederick S Merritt
By School Mathematics Project
By Thomson, William T.
By Peter Burberry
By R.A. Otter
By Construction Industry Research and Information Association
By W.S. Pellini
By Jones, Professor Steve
By Trefor J. Reynolds, Lewis E. Kent, David W. Lazenby
By Dr Giovanni Iazzetti & Dr. Enrico Rigutti