1. Holistic Requirements Model http://www.burgehugheswalsh.co.uk/uploaded/documents/HRM-Tool-Box-V1.0.pdf http://www.burgehugheswalsh.co.uk
2. Requirements Document Template examples: Mil-Std-498 Data Item Descriptions, System/Subsystem Specification (DID-SSS) 1994 http://en.wikipedia.org/wiki/MIL-STD-498
3. Federal Aviation Administration FAA Acquisition System Toolset (FAST) 2014 http://fast.faa.gov/
4. Defense Acquisition University US Air Force Systems Requirements Document (SRD) ADDM Template v 1.1 2012 https://acc.dau.mil/CommunityBrowser.aspx?id=656044
5. CVR/IT Consulting 2012 Project Requirements Document http://www.cvrit.com/PM_Templates/TemplateDetails10.html