கேள்வி: பெரட்டா எம்9 - உசாத்துணை பற்றி விளக்கவும்.
பதில்: * [http://www.army.mil/factfiles/equipment/individual/m9.html Army Factfile on the Beretta M9 Pistol] * [http://archive.gao.gov/d15t6/137930.pdf GAO Report NSIAD-89-59] * [http://archive.gao.gov/d16t6/136824.pdf GAO Report NSIAD-88-213] * [http://www.gao.gov/decisions/bidpro/297313.pdf GAO Decision] * [http://www.uscfc.uscourts.gov/Opinions/Bush/06/BUSH.PHTSupplyCorp.pdf Court of Federal Claims] * Almanac of American Military History, Volume 1: page 2099 (see Note #2)