Focus on proficiency :
O'Connell, Sue.
Focus on proficiency : teacher's book / Sue O'Connell. - revisada. - London : Nelson, 1992. - 64 p. ; 28 cm.
Al pie de la portada: revised and enlarged edition with exam practice material.
0-17-556419-1
PE1128 / .A2 O26a
Focus on proficiency : teacher's book / Sue O'Connell. - revisada. - London : Nelson, 1992. - 64 p. ; 28 cm.
Al pie de la portada: revised and enlarged edition with exam practice material.
0-17-556419-1
PE1128 / .A2 O26a
