APA:
Ćalić-Ljubojević, Jelena (2000). Natural bridges on the Vratna river (Eastern Serbia) as the last remnants of a former cave.
Acta carsologica, volume 29, issue 2, str. 241-248.
URN:NBN:SI:DOC-1I14AX99 from http://www.dlib.si
MLA:
Ćalić-Ljubojević, Jelena. "Natural bridges on the Vratna river (Eastern Serbia) as the last remnants of a former cave."
Acta carsologica volume 29. issue 2 (2000) str. 241-248.
<http://www.dlib.si/?URN=URN:NBN:SI:DOC-1I14AX99>