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Chapter1
- http://blog.naver.com/thl0818/221085219318
- http://www.ddaily.co.kr/news/article.html?no=115248
- http://terms.naver.com/entry.nhn?docId=3588312&categoryId=58707&cid=42171
- https://www.gnu.org/philosophy/free-sw.html
- https://en.wikipedia.org/wiki/Free_software_movement
- https://en.wikipedia.org/wiki/Free_Software_Foundation
- https://ko.wikipedia.org/wiki/GNU_%EC%9D%BC%EB%B0%98_%EA%B3%B5%EC%A4%91_%EC%82%AC%EC%9A%A9_%ED%97%88%EA%B0%80%EC%84%9C
- https://ko.wikipedia.org/wiki/%EC%9E%90%EC%9C%A0_%EC%86%8C%ED%94%84%ED%8A%B8%EC%9B%A8%EC%96%B4_%EC%9E%AC%EB%8B%A8
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Chapter2
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Chapter3
- https://source.android.com/
- https://en.wikipedia.org/wiki/NCSA_HTTPd
- https://en.wikipedia.org/wiki/Richard_Stallman
- https://opensource.org/history
- https://en.wikipedia.org/wiki/Open_Source_Initiative
- https://www.informationweek.com/the-torvalds-transcript-why-i-absolutely-love-gpl-version-2/d/d-id/1053128
- https://en.wikipedia.org/wiki/Linux
- https://opensource.org/osd-annotated
- https://ko.wikipedia.org/wiki/%EC%BA%90%EB%85%B8%EB%8B%88%EC%BB%AC
- https://en.wikipedia.org/wiki/Mozilla
- http://www.gnu.org/gnu/manifesto.ko.html
- http://www.ciokorea.com/news/17585?page=0,0
- https://ko.wikipedia.org/wiki/%EB%A6%AC%EB%88%84%EC%8A%A4_%ED%86%A0%EB%A5%B4%EB%B0%9C%EC%8A%A4
- https://ko.wikipedia.org/wiki/%EC%97%90%EB%A6%AD_%EB%A0%88%EC%9D%B4%EB%A8%BC%EB%93%9C
- https://wiki.kldp.org/wiki.php/DocbookSgml/Cathedral-Bazaar-TRANS
- http://community.apache.org/
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Chapter4
- http://news.naver.com/main/read.nhn?mode=LSD&mid=sec&sid1=105&oid=031&aid=0000397600
- http://www.itworld.co.kr/tags/1261/%EB%A6%AC%EB%88%85%EC%8A%A4/102418
- http://www.bloter.net/archives/16333
- https://namu.wiki/w/%EC%97%98%EB%A6%BC%EB%84%B7%EA%B3%BC%20%ED%95%98%EC%9D%B4%EC%98%A8%EB%84%B7%20%EC%82%AC%EA%B1%B4