Spyra, Janusz. “Paradisal Are Cieszyn Areas or How Doctor František Sláma Tried Cieszyn Gypsies”. Studia Etnologiczne I Antropologiczne, vol. 11, Dec. 2011, pp. 244-56, https://trrest.vot.pl/ojsus/index.php/SEIA/article/view/9040.