APA:
Osborne, R. Armstrong L. (2007). The world's oldest caves.
Acta carsologica, volume 36, issue 1, str. 133-142.
URN:NBN:SI:DOC-OCFT4T3V from http://www.dlib.si
MLA:
Osborne, R. Armstrong L.. "The world's oldest caves."
Acta carsologica volume 36. issue 1 (2007) str. 133-142.
<http://www.dlib.si/?URN=URN:NBN:SI:DOC-OCFT4T3V>