Strzyż, Piotr, et al. “Hackbuts from Chełm Town-Hall. A Contribution to Knowledge about Central-European Hand-Firearms in the 16th Century”. Acta Archaeologica Lodziensia, vol. 62, Dec. 2021, pp. 99-108, https://journals.ltn.lodz.pl/Acta-Archaeologica-Lodziensia/article/view/2016.