By Pople, Stephen
By Wallis
By University of York Science Education Group, Nuffield Curriculum Centre
By Raitt, Gordon
By Gilmour, Thane
By LETTS EDUCATIONAL
By unkown
By Booth, Graham
By Educational Experts
By Unknown
By Milner, Bryan
By Breithaupt, Jim, Dunn, Ken
By Booth, Graham, McDuell, G.R.
By Shepherd, Michael, Lovat, Ian, Lovat, Ian
By McDuell, G.R., Booth, Graham
By Walters, Cathy
By Newman, Viv
By Hawkins, Glenn
By Chadha, Gurinder
By Vorderman, Carol