By Parragon Books
By Povey, Thomas
By ALISON JEFFERSON
By Cundy, H.M., Rollett, A.R.
By Gibbs, WILLIAM
By Jordan, David
By Maxwell, Sadie
By Nash, Jenny
By Worden, Jan
By School Mathematics Project
By Kirkby, David
By McDougal Littel
By Kirkby, Dave, DavidM, Ruth Merttens, Dave Kirkby
By Hirst, Keith
By Lowndes, Sue, D'Angelo, Simon, Jeffrey, Andrew, Gibbs, Elizabeth
By Jeffrey, Andrew
By Jeffrey, Andrew, Wing, Tony
By Kirkby, DavidM, Ruth Merttens, David Kirkby
By Brodie, Andrew
By Brodie, Andrew, Andrew Brodie
By Schofield & Sims, Steve Mills, Hilary Koll