APA: 
Sanna, Laura, Forti, Paolo, Lauritzen, Stein-Erik (2011). Preliminary U/Th dating and the evolution of gypsum crystals in Naica caves (Mexico). 
Acta carsologica, letnik 40, številka 1, str. 17-28. 
URN:NBN:SI:doc-R37TBREV from http://www.dlib.si
 
                           MLA: 
Sanna, Laura, Forti, Paolo, Lauritzen, Stein-Erik. "Preliminary U/Th dating and the evolution of gypsum crystals in Naica caves (Mexico)." 
Acta carsologica letnik 40. številka 1 (2011) str. 17-28.
<http://www.dlib.si/?URN=URN:NBN:SI:doc-R37TBREV>