By Bolt, Brian, Brian Bolt
By Hewett, Barbara
By Chapman, Jenny L., Reiss, Michael
By Holding, John
By School Mathematics Project
By SPMG, Scottish Primary Maths Group
By Straker, Anita
By Eagle, Ruth
By Snape, Charles, Scott, Heather
By Phillips, Richard
By Norman, L. C.
By Atkinson, Sue, Harrison, Sharon, Rousham, Laurie
By Straker, Anita, Anita Straker
By Kirkby, David
By Harrison, Paul, Mumford, Jeanette