i've never read any book but found the videos on youtube is very useful. i normally watch Badminton England's video and coachingbadminton's video. Just do a search for them on youtube.
Jack Downey's books are good too. http://www.badminton-information.com/jake-downey-biography-badminton-books.html I especially like the doubles book.
I purchase a book and the enclose DVD (63min) from Takashimaya book store in Singapore and the same store is also located at The Dubai Mall - not certain if the same book is available in Dubai. It's title Perfect Master - DVD sports. It has other sporting titles too besides badminton. The book focuses on fundimentals and proper strokes in badminton. A good book for tutorial. Unfortunately, both the book and DVD are in Japanese. But as with most Japanese tutotrial books, they do have timelapse photography making it very user friendly.
