1. Americans’ Attitudes about Privacy, Security and Surveillance
http://www.pewinternet.org/2015/05/20/americans-attitudes-about-privacy-security-and-surveillance/
2. Privacy policies as decision-making tools
3. Ten Steps to Develop a Multilayered Privacy Notice
https://www.huntonprivacyblog.com/wp-content/uploads/sites/18/2012/07/Centre-10-Steps-to-Multilayered-Privacy-Notice.pdf
4. Best PRACTICES in Drafting Plain-Language and Layered Privacy Policies
https://iapp.org/news/a/2012-09-13-best-practices-in-drafting-plain-language-and-layered-privacy/
5. Privacy and Freedom;Westin,1967