APA: 
Porter, Megan L., Dittmar, Katharina, Pérez-Losada, Marcos (2007). How long does evolution of the troglomorphic form take?. 
Acta carsologica, letnik 36, številka 1, str. 173-182. 
URN:NBN:SI:doc-1LPU7G1F from http://www.dlib.si
 
                           MLA: 
Porter, Megan L., Dittmar, Katharina, Pérez-Losada, Marcos. "How long does evolution of the troglomorphic form take?." 
Acta carsologica letnik 36. številka 1 (2007) str. 173-182.
<http://www.dlib.si/?URN=URN:NBN:SI:doc-1LPU7G1F>