By Ritter, Klaus
By Cantor, Georg, Jourdain
By E Lines, Malcolm
By Jorgensen, Steffen, Quincampoix, Marc, Vincent, Thomas L.
By Lakshminarayanan, P. A., Aghav, Yoghesh V., Shi, Yu, Reitz, Rolf D.
By Buttlar, William G., Chabot, Armelle, Dave, Eshan V., Petit, Christophe, Tebaldi, Gabriele
By Obodan, Natalia I., Lebedeyev, Olexandr G., Gromov, Vasilii A.
By Greaves, Simon, Collins Easy Learning
By Kingfisher, Basher, Simon
By Critchley, Peter
By Ladybird, Merritt, Kate
By Jones, Gareth A., Josephine M.
By Watson, Carol, Higham, David
By Anthony, Martin
By Launay, Mickael, Wilson, Stephen S.
By Cochrane, Richard
By Derbyshire, John
By Zegarelli, Mark
By June Haighton, Debbie Holder, Veronica Thomas
By Deutsch, David
By Ladybird Books
By Crapo, H., Senato, D.
By Lyndon, R., Schapp, P. E.
By Schofield & Sims, Steve Mills, Hilary Koll
By Bradbury, Lynne, Witcomb, Gerald
By Schofield & Sims, Anne Evans
By Schofield & Sims, Andrew Parker, Jane Stamford
By Neill, Hugh, Johnson, Trevor
By Collins Easy Learning