National and University Library of the Republic of Srpska

The National and University Library of the Republic of Srpska (NUBRS) (Serbian, Croatian, and Bosnian: National and University Library of the Republic of Srpska) is the national library of Republika Srpska, located in the city of Banja Luka.

More information on the Wikipedia page

The website, in Serbian, is [http://nub.rs/pocetna/