some more

http://rapidshare.com/files/75151508/GMAT_Official_Guide_11th_Ed.pdf

http://www.manhattangmat.com/official-guide-12.cfm

http://rapid4me.com/?q=gmat+official+guide+12th+edition


http://books.sharedaa.com/2009/08/the-official-guide-for-gmat-review-12th-edition.html