By M. J. D. Powell
By Tom Apostol
By Dominic Welsh (Fellow and Tutor in Mathematics, Fellow and Tutor in Mathematics, Merton College, Oxford)
By Ross L. Finney, George B. Thomas
By Mark Rowland, Rowland, Mark
By K. F. Riley (University of Cambridge), M. P. Hobson (University of Cambridge), S. J. Bence
By Sherman K. Stein
By Collins GCSE
By D C Spencer, David V. Widder
By Eastaway, Rob, Rob Eastaway, Jeremy Wyndham
By Frank Ayres, Elliott Mendelson
By Open University Course Team
By Sherman K. Stein, Anthony Barcellos
By A. Francis
By Paul Abbott, Hugh Neill
By Swokowski, Earl
By Charles Dixon
By Brani Vidakovic (Georgia Institute of Technology)
By Stefan Hildebrandt, Anthony Tromba
By D. Dakin, R. I. Porter, A. Dakin, R.I. Porter
By Nicholas Strange
By B. R. Gelbaum, J. M. H. Olmsted
By Perloff, Jeffrey M.
By Latorre, D.R., etc.
By Chaitin, Gregory J.
By Jordan, Dominic, Smith, Peter
By Milewski, Emil G.
By Marti, Kurt, Kall, Peter