bluebook-law-review.csl is from the Citation Style Language styles repository
(https://github.com/citation-style-language/styles). Its authors and
contributors are listed in the file. It is licensed under the Creative Commons
Attribution-ShareAlike 3.0 License
(https://creativecommons.org/licenses/by-sa/3.0/), not the Apache License that
covers the rest of coursebook.
