Hello, Nina. If I can be frank with you, with advanced students it is time to create or aggregate your own materials for general courses. Few advanced learners are interested in plodding through a textbook, and I have seen none appropriate for the level of advanced learners.
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Nina Andrews also for books that teach how to improve one's English academic writing.I agree that some specialized ESP texts are at an advanced level. I suggest that you find an academic writing book (and lots of material is also available on the internet) geared toward native-speaker college students. Such material is certainly equally appropriate for adva