Gębica, Piotr, et al. “Lithology, Origin and Age of Sediments in the Kalników and Chotyniec in the Tarnogród Plateau (Sandomierz Basin): Https: doi.Org 10.26485 AGL 2017 106 6”. Acta Geographica Lodziensia, vol. 106, Dec. 2018, pp. 65-86, https://journals.ltn.lodz.pl/Acta-Geographica-Lodziensia/article/view/78.