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rockymountainarsenalarchive.wordpress.com
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"Fact Sheet - Yellow LeafArchived 2009-03-09 at the Wayback Machine", Office of the Assistant Secretary of Defense (Health Affairs), Deployment Health Support Directorate, accessed November 15, 2008.
"Army R&D Chief Entertains Quadripartite Group"(PDF). Army Research and Development Magazine. 4, No.4 (April 1963). Headquarters, Department of the Army: 12. 1963. Archived from the original(PDF) on October 19, 2012. Retrieved September 30, 2013. This article incorporates text from this source, which is in the public domain.