In this section, I recommend books which I use in my teaching, and which I have found to be particularly useful and good value for money. All the books listed below are available online and from booksellers. They are usually cheaper online, so shop around! You can save a lot of money by buying slightly older editions, particularly with the larger (A level) bilingual dictionaries, but don't buy anything which is more than about five years old, as new technical vocabulary and colloquialisms are added frequently. I have not given ISBN numbers here, as these vary as each new edition comes out. If you put the main title of each book into a search engine for an online bookseller, it will show you the options available. Some of these books are even available second hand, if you are on a tight budget.