NIST SP 800-160
Ross, R., J.C. Oren, M. McEvilley. 2014. Systems Security Engineering: An Integrated Approach to Building Trustworthy Resilient Systems. Gaithersburg, MD. National Institute of Standard and Technology (NIST) Special Publication (SP). NIST SP 800-160:2014 (Initial Public Draft)
This source is considered a primary reference for the Security Engineering article.
Accessed July 4, 2015 at http://csrc.nist.gov/publications/drafts/800-160/sp800_160_draft.pdf