CSS books for reference

Hi guys

i'm after a CSS reference book that isn't the size of a door stop! I do some coding via lap top whilst i work away and hauling a book round thats bigger than a laptop isn't something i'd relish. It'd also be handy at home...as i only have a small desk!
Just a pocket sized reference guide, more of a reminder list really! Can anyone recommend anything that is up to date?

Thanks

Any CSS books will do as long as it's been released in 2009 or later.
 
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