Freeman, Major Marshall A. (5 April 1991). The Army Needs a Strategic Armored Gun System—Now!(PDF) (War College Individual Study Project). U.S. Army War College, Carlisle Barracks. pp. 23–24. Archived(PDF) from the original on 12 May 2022. Retrieved 10 March 2022. This article incorporates text from this source, which is in the public domain.
"Armored Gun System Loses Weight to Be Deployed by C-130". Inside the Pentagon. Vol. 9, no. 31. Inside Washington Publishers. 5 August 1993. JSTOR43990667.
Freeman, Major Marshall A. (5 April 1991). The Army Needs a Strategic Armored Gun System—Now!(PDF) (War College Individual Study Project). U.S. Army War College, Carlisle Barracks. pp. 23–24. Archived(PDF) from the original on 12 May 2022. Retrieved 10 March 2022. This article incorporates text from this source, which is in the public domain.