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