1. COPPA - Children's Online Privacy Protection Act. http://www.coppa.org/coppa.htm. COPPA - Children's Online Privacy Protection Act. http://www.coppa.org/coppa.htm.
2. Flesch-Kincaid readability test. https://en.wikipedia.org/wiki/Flesch%E2%80%93Kincaid_readability_tests. Flesch-Kincaid readability test. https://en.wikipedia.org/wiki/Flesch%E2%80%93Kincaid_readability_tests.
3. FTC's first fines for violating online kids' privacy law. http://www.computerworld.com/article/2592253/government-it/ftc-assesses-first-fines-for-violating-online-kids-privacy-law.html. FTC's first fines for violating online kids' privacy law. http://www.computerworld.com/article/2592253/government-it/ftc-assesses-first-fines-for-violating-online-kids-privacy-law.html.
4. The porter stemming algorithm. http://tartarus.org/martin/PorterStemmer/. The porter stemming algorithm. http://tartarus.org/martin/PorterStemmer/.
5. Privacygrade: Grading the privacy of smartphone apps. http://privacygrade.org/. Privacygrade: Grading the privacy of smartphone apps. http://privacygrade.org/.