Leszek Erenfeicht: PM-63: Poland’s First PDW. Forgotten Weapons, 2013-02-13. [dostęp 2021-04-03]. Cytat: In late 1956 and early 1957 he had already created a study of such weapon, with the grip-mounted magazine well and slide telescoping over the barrel, something of a cross between a classic SMG and a semiautomatic pistol. (ang.).
