Betsis

Illustrated Idioms B1 & B2 - Book 2 - Teacher's Book

By Betsis, Andrew ; Mamas, Lawrence

Global ELT - Dictionary of Synonyms

By Betsis, Andrew

The Vocabulary Files C1 Teacher's Book (IELTS 6.0-7.0)

By Betsis, Andrew ; Mamas, Lawrence, Andrew

Global ELT - English Idioms Dictionary

By Betsis, Andrew & Manser Martin H.

The Grammar Files - English Usage - Student's Book - Upper-Intermediate B2 / IELTS 5.0-6.0

By Betsis, Andrew ; Mamas, Lawrence

Successful Cambridge FCE - Teacher's Book with 10 Practice Tests and FCE Exam Guide

By Betsis, Andrew ; Mamas, Lawrence

Succeed in TOEIC - Teacher's Book with 10 Practice Tests

By Betsis, Andrew