By Open University Course Team
By OU Tutors
By W H Brock, A.J. Meadows
By Association for Science Education
By Ernest Clarke
By Schofield & Sims, Andrew Parker, Jane Stamford
By C.H. Walker, R.M. Sibly, D.B. Peakall, Steve P. Hopkin
By Garry Procter, J. Leonard, Barry Lygo
By David Phoenix, Phoenix, David