维基共享资源上的相关多媒体资源:12.7×99mm NATO 50 Caliber Shooter's Association(页面存档备份,存于互联网档案馆) Fifty Caliber Shooter's Association UK(页面存档备份,存于互联网档案馆) Fifty Caliber Institute
(ISSN: 02653818), Volume 40 Issue 21, pp 26–28. FN Herstal: 5.7x28mm, the new NATO caliber for pistols and submachine guns. www.edrmagazine.eu. February 25