1. Balduzzi, M., & Ciancaglini, V. n.d.. Cybercrime in the Deep Web. In Black Hat EU, Amsterdam 2015. Retrieved from https://www.blackhat.com/docs/eu-15/materials/eu-15-Balduzzi-Cybercrmine-In-The-Deep-Web-wp.pdf.
2. Bergman, M. K. (2001). White paper: the deep web: surfacing hidden value. Journal of electronic publishing, 7(1).
3. Bernstein, M. S., Monroy-Hernandez, A., Harry, D., Andre, P., Panovich, K., & Vargas, G. n.d.. 4chan and /b/: An Analysis of Anonymity and Ephemerality in a Large Online Community. 8.
4. Best, C. (2011). Challenges in open source intelligence. Intelligence and Security Informatics Conference (EISIC), IEEE: 58-62).
5. Cardenas-Haro, J. A., & Dawson, M. (2017). Tails Linux Operating System: The Amnesiac Incognito System in Times of High Surveillance, Its Security Flaws, Limitations, and Strengths in the Fight for Democracy in Security Solutions for Hyperconnectivity and the Internet of Things, 260-271. IGI Global.