referat

1. (at school, university) paper; presentation
   Za sutra moram da napišem referat iz biologije. — I have to write a biology paper for tomorrow.
   Ana je držala referat o Tesli pred celim razredom. — Ana gave a presentation on Tesla to the whole class.
2. (at a conference) paper; talk
   Na konferenciji je podneto preko pedeset referata. — Over fifty papers were presented at the conference.

Usual collocations are pisati referat "write a paper" and držati / podneti referat "give a talk".