James L. Ballou / SAR Staff ((December 2004 / August 2, 2022). “The Rarest MG on the Line”. Small Arms Review V8N3((December 2004) / SmallArmsReview.com. 2022年3月24日閲覧。
James L. Ballou / SAR Staff (Mar 2010 / September 6, 2022). “THE UNITED STATES’ NAVAL USE OF BARS IN BLIMPS”. SMALL ARMS REVIEW, V13N6 (Mar 2010), / SMALL ARMS REVIEW.com. 3, 24, 2023閲覧。