411 REFERENCE · Wikibooks
How to Think Like a Computer Scientist: Learning with Python 2nd Edition/Copyright Notice
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Copyright Notice
Copyright (C) Jeffrey Elkner, Allen B. Downey and Chris Meyers.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with Invariant Sections being Forward, Preface, and Contributor List, no
Front-Cover Texts, and no Back-Cover Texts. A copy of the license is
included in the section entitled "GNU Free Documentation License".