Found in 2 comments on Hacker News
koide · 2016-01-10 · Original thread
This analysis is a badly regurgitated copy of the free O'Reilly e-book about software architectures by Mark Richards located at http://www.oreilly.com/programming/free/software-architectur...

It's a lot worse than the original.

petercooper · 2015-04-02 · Original thread
I definitely support direct linking to things on the Web, but since O'Reilly probably meant for this to only be grabbed via an initial landing page, I figured I'd link to it too in case anyone wants some background separate to the PDF: http://www.oreilly.com/programming/free/software-architectur...

Fresh book recommendations delivered straight to your inbox every Thursday.