By Unstated
By Mitchell, Margaret, Strange, Derek
By Levin, Ira, Strange, Derek
By Grisham, John, Strange, Derek
By Bloch, Robert
By Baker, Clare
By Stefanou, Rosemarie, Harvey-Jones, Sir John
By Scottish Primary Mathematics Group
By Clarke, L.Harwood
By Mzamane, Mbulelo Vizikhungo
By Amadi, Elechi
By Dowdeswell, W.H.
By Edge, Julian
By Shuter, Jane, Reynoldson, Fiona
By Lanzer, Harriette
By Marland, Michael
By Scottish Secondary Science Working Party
By Jim Jardine
By Donert, Karl
By Hollett, Vicki
By Curtis, Barry, etc.
By Dickinson, Peter
By Goodheart, Berny, Cox, James