Which is the best for turkish - english dictionary, and visa versa? Where can I purchase it, online or a bookstore in London? Thanks

hi i think for a book redhouse dictionary

http://www.internetpolyglot.com/turkish/lessons-tr-en

Try Foyles near Oxford Street, they have a good selection of foreign language material. Also Waterstones on Gower Street has a good selection for SOAS students. That's where I bought mine from.