This work, "free-programming-books", is licensed under the
Creative Commons Attribution 4.0 International License. To view a copy of
this license, visit https://creativecommons.org/licenses/by/4.0/ or send
a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.

It is attributed to Victor Felder and the Free Ebook Foundation.
https://github.com/EbookFoundation/free-programming-books