By OU Course Team
By Open University Course Team
By D. Johnson, M. Scott
By J Manners
By Duncan Shaw
By Ian Poole
By Shamil Naoum, Naoum, Shamil
By N. N. Greenwood, A. Earnshaw, Greenwood, N. N., Earnshaw, A.
By Mike Tooley, Tooley, Mike
By Leslie de Chernatony, Leslie de Chernatony, Malcolm McDonald, de Chernatony, Leslie, de Chernatony, McDonald, Malcolm
By Lambert, David
By Peter North
By Neil J. Salkind, Salkind, Neil J.
By Charles Heatwole, Heatwole, Charles
By National Geographic Society