APA: 
Žetko, Katarina Dea (2010). The present perfect and preterite in British and American English. 
ELOPE (Ljubljana), vol. 7, str. 27-46. 
URN:NBN:SI:DOC-YX45TS8N from http://www.dlib.si
 
                           MLA: 
Žetko, Katarina Dea. "The present perfect and preterite in British and American English." 
ELOPE (Ljubljana) vol. 7 (2010) str. 27-46.
<http://www.dlib.si/?URN=URN:NBN:SI:DOC-YX45TS8N>