The Erma en:EMP 44 sub-machine gun
A. J. R. Cormack (1972) Erma Submachine Guns. Small Arms Profiles no. 8, page 149, OCLC 506029049
CC BY-SA 4.0
<a href="//commons.wikimedia.org/wiki/File:EMP44_Aberdeen.jpg" title="File:EMP44 Aberdeen.jpg">File:EMP44_Aberdeen.jpg</a>