By Oxford University Press
By Severe, Dr Sal
By Bingham, Jane M.
By Reader's Digest
By Michael J. Walsh
By Arthur Mee
By Osborn, P.G., Rutherford, L.A., Bone, Sheila
By Laurence Urdang
By McIntosh, Colin
By Nevins, Albert, McIlrath, James
By Unidentified Author
By Daintith, John
By Collin, S.M.H., P. H.
By Dissing, B., Helles, S., Axelsen, Jens, Vinterberg, H.
By Chambers Harrap
By Curl, Michael
By Lewis, D. Geraint
By Allen, Robert
By Andrews, Robert, Kate, Hughes
By Britannica
By Ayto, John
By Ash, Russell
By N/A
By Publishing, DK
By Gabbitas
By Collins
By Yale