Any suggestion on a good badminton reference book? I can't find any in book stores and am not prepared to order one within first looking at it.
Try looking at this thread, it describes a book that is pretty good: http://www.badmintonforum.com/forums/read.php?f=2&i=19228&t=19228
I can give you names on some of them, in addition to the one Cheung introduced here a while ago. They're all very good ones, in my opinion. One is on thorough analysis on Doubles (of all kinds) strategies. However, I think they're all out-of print. I ran into them in a few libraries back in Canada. So perhaps you can try your luck at your local library. You may be presently surprised. :>