By Zegarelli
By CGP Books
By Letts A-level
By Skrakowski, Joe
By Firth, Peter
By Collins, JD
By Cox, C. J., Bell, D
By Steve Chinn
By DAN CRYAN, SHARRON SHATIL, BILL MAYBLIN, Mayblin, Bill, Cryan, Dan, Shatil, Sharron
By Abrams, Iwona, Sardar, Ziauddin
By Clarke, Peter
By Selby, Peter H.
By School Mathematics Project
By Collins Learning
By Hudson, Sallie
By Ridgway, Bill
By Ardley, Neil
By Bynum, William F., etc., Browne, F., Porter, Roy
By Ian Glynn
By Houston, Kevin
By Mackay, Alan L.
By Alcock, Lara
By Rayner, David
By Waltham, David
By B. R. Gelbaum, J. M. H. Olmsted