Focus on proficiency /
O'Connell, Sue.
Focus on proficiency / Sue O'Connell. - revisada. - London : Collins ELT, 1989. - 224 p. ; 28 cm.
Reimp., 1991. Al pie de la portada: revised and enlarged edition with exam practice material.
0-00-370268-5
PE1128 / .A2 O26
Focus on proficiency / Sue O'Connell. - revisada. - London : Collins ELT, 1989. - 224 p. ; 28 cm.
Reimp., 1991. Al pie de la portada: revised and enlarged edition with exam practice material.
0-00-370268-5
PE1128 / .A2 O26
