"Construction Update". Pentagon Memorial Fund. November 13, 2006. Archived from the original on September 16, 2009. Retrieved November 15, 2006.
"Visitor Services: Pentagon Tours and Memorial: Pentagon Memorial". United States Department of Defense Washington Headquarters Services. Archived from the original on April 18, 2014. Retrieved April 18, 2014. For hours of operation, click on "Hours of Operation"; for photography information, click on "Conduct on the Pentagon Reservation". Both are under the "Pentagon Memorial" tab.
"About the DC Walk". U.S. Department of Defense. Archived from the original on September 11, 2007. Retrieved September 13, 2007.
whs.mil
"Visitor Services: Pentagon Tours and Memorial: Pentagon Memorial". United States Department of Defense Washington Headquarters Services. Archived from the original on April 18, 2014. Retrieved April 18, 2014. For hours of operation, click on "Hours of Operation"; for photography information, click on "Conduct on the Pentagon Reservation". Both are under the "Pentagon Memorial" tab.