1. Small Arms Ammunition (9mm Parabellum), Standardization Agreement No. 4090, second ed., NATO Military Agency for Standardization, 15 April 1982.
2. Manual of Proof and Inspection Procedures, PFP(NAAG-LG/3-SG/1)D(2004)1, NATO Military Agency for Standardization, 30 September 2004.
3. Exchange of electronic mail with J.P. Sauer and Sohn GmbH and Heckler and Koch GmbH, June 2009.
4. Technische Richtlinie (TR), Pistolen im Kaliber 9mm×19, Polizeitechnisches Institut (PTI) der Deutschen Hochschule der Polizei, Münster, Germany, January 2008, .
5. Autoloading Pistols for Police Officers, NIJ Standard-0112.03, National Institute of Justice, US Department of Justice, July 1999, .