By Franzeska, G.Ewart
By Gardner, Kay
By Riley, Peter D., Gaines, Keith
By Jennings, Terry
By Barnham, Kay
By Morgan, Nina
By Taylor, Kim, Taylor, Kim
By Polly Goodman
By Graham, Elspeth, Wray, David
By Rosemary Rodger
By Pollock, Stephen, Wingham, Peter
By Morris, Neil
By School Mathematics Project
By Julie Bolter, Julia Fletcher, Paul Rigby, Maryanne Tipler, Rowena Wilcox
By Bolter, Julie, Bullock, Simon, Timperley, Susan
By Chapman, Colin
By Conrad, Joseph
By Dixon, Charles, Scottish Mathematics Group
By Westall, Robert
By Golding, Julia