Succeed in KET For Schools - 6 Practice Tests (Carte+cheie+CD)

Dictionary of Idioms - Martin H. Manser

Dictionary of Phrasal Verbs - Martin H. Manser

Learner's Dictionary - Martin H. Manser, Andrew Betsis

Dictionary of Business - David Hicks, Andrew Betsis, Sean Haughton

Dictionary of Economics - Mark Tompson, Andrew Betsis

Dictionary of Synonyms - Martin H. Manser, Andrew Betsis

The Grammar Files. IELTS B2 Teacher's Book - Andrew Betsis, Lawrence Mamas

Upgrade Your Grammar CEFR B2 Self-study - Andrew Betsis, Lawrence Mamas

Grammar files C1 Teacher's book - Andrew Betsis