* Fisher, R., Norman, M., & Peerenboom, J. (2018). Resilience history and focus in the United States. INL/MIS-16-40758-Revision-0. U.S. Department of Energy, Idaho National Laboratory. [PDF here.]
* Hemme, K. (2015). Critical infrastructure protection: Maintenance is national security. Journal of Strategic Security, 8(3 Suppl.), 25-39. [PDF here.]
* Office of the Press Secretary. (2013, February 12). Presidential policy directive — Critical infrastructure security and resilience. PPD-21. The Whitehouse.
* PPD21 CIP – PDF Document
* Moteff, J. D. (2015, June 10). Critical infrastructures: Background, policy, and implementation. RL30153. U.S. Congressional Research Service.
* U.S. Department of Homeland Security. (2013). NIPP 2013: Partnering for critical infrastructure security and resilience. [National Infrastructure Protection Plan].
* U.S. Department of Homeland Security. (2008). A guide to critical infrastructure and key resources protection at the state, regional, local, tribal, and territorial level.
* A Guide to Critical Infrastructure and Key Resources – PDF Document (4.07 MB)
* 6 U.S.C. §§ 671-674 (2018). Critical infrastructure information. [PDF here.] [Alternate PDF available here.]
* Critical Infrastructure Information Act of 2002
