BB | |
BB | BEIGDEBER ATIENZA, F.: Diccionario Politécnico de las Lenguas Española e Inglesa. Díaz de Atienza |
BB | Dudley-Evans, Tony. . Engineering / Tony Dudley-Evans, Tim Smart, John Wall . [1st ed., 6th. imp.] Harlow, Essex : Harlow, Essex :Longman, 1987 |
BC | ALEXANDER, L. G.: Longman English Grammar Practice. Longman. 1990 |
BC | MURPHY, Raymond: English Grammar in Use. (Intermediate)Cambridge University Press. 1992 |