By CGP Books
By Nina Filipek, Jeannette O'Toole
By Alcock, Lara
By Help with Homework
By Smith, G.R.Gilbart-, etc.
By Rayner, David
By Ludowyk, E.F. C.
By Pluckrose, Henry, Fairclough, Chris
By Graves, Sue
By Jo Boaler
By Llewellyn, S., Greer, Alex
By Schofield & Sims, Steve Mills, Hilary Koll
By Lewis, G.
By Mathematics in Action Group
By Bental, L.M.
By Castle, Frank
By Graham, Christine
By Patilla, Peter
By Brodie, Andrew
By Rayner, D.
By Pate, Katherine, Norman, Naomi
By Beadsworth, Tony