All books are compiled via some kind of sources
Most of the books on STL and system are around information compiled
around the web and from MSDN library included in your CD/DVD
installing VS.
Some of the writers'relative just plainly copied and pasted the frames
and fill them up with their own words to make it see different. Same
body in different clothe
With tones and words from the author himself
You don't need to buy any of it.