By School Mathematics Project
By Smith, Frank, Frank Smith
By Open University
By Wells, David
By School Mathematics Project, Unnamed
By Bolt, Brian
By Marilyn Burns, Burns, MARILYN
By Snape, Charles, Scott, Heather
By Snape, Scott, Heather
By Edwards, Roy, Edwards, Mary, Ward, Alan, Roy Edwards, Mary Edwards, Alan Ward
By Edwards, Roy, Edwards, Mary, Ward, Alan