^Kogovšek, Janja; Pipan, Tanja; Stanka, Šebela; Zupan Hajna, Nadja. "Postojnski jamski sistem" [Postojna Cave System]. In Šmid Hribar, Mateja; Golež, Gregor; Podjed, Dan; Kladnik, Drago; Erhartič, Bojan; Pavlin, Primož; Ines, Jerele (eds.). Enciklopedija naravne in kulturne dediščine na Slovenskem – DEDI [Encyclopedia of Natural and Cultural Heritage in Slovenia] (in Slovenian). Archived from the original on 27 March 2019. Retrieved 14 August 2012.
^Scheffel, Richard L.; Wernet, Susan J., eds. (1980). Natural Wonders of the World. United States of America: Reader's Digest Association, Inc. pp. 304–305. ISBN0-89577-087-3.