By Bennett, Paul, Cave, Martin
By McNab, Rosi, Barrabe, Fabienne
By Cooper, Simon
By Scottish Primary Mathematics Group
By Martin, Rodney
By National Curriculum Council
By Moses, John A.
By Mills, Steve, et al
By Rossner, R.
By Martin, Fred, Whittle, Aubrey
By Whitcomb, Alan
By N.G. Masson, F. Monaghan, L. Thompson
By Salters' Science Team, Aitkin, Mary, etc.
By Umeasiegbu, Remo Nna
By SPMG
By Dickens, Charles
By Abbott, A.F., Nelkon, Michael
By O'Neill, Robert, etc., Kingsbury, R, Yeadon, T, Scott
By Betty Morgan Bowen, Roger H Flavell, Monica Vincent