See:
- Szymon Zdziebłowski, Scientists discover the oldest human remains in Poland; they are over 100,000 years old-http://scienceinpoland.pap.pl/en/news/news%2C31287%2Cscientists-discover-oldest-human-remains-poland-they-are-over-100000-years-old.html
- http://www.ojcow.pl/english/caves.htm
- https://klubpodroznikow.com/relacje/podziemia/1774-jaskinia-ciemna-
- Paweł Valde-Nowak, A Neolithic Child Burial from Ciemna Cave in Ojców National Park, Poland -https://rcin.org.pl/Content/130394/WA308_103307_Neolithic-Child_I.pdf