You can get information from the Tourism Organization of Teslic:
 

address:  Karadjordjeva 6, Teslic
phone: +387 53 411 550  

or

Tourism Organization of Republika Srpska:
address: Brana Milosavljevica 8, Banja Luka
phone: +387 51 229 720
e-mail: tors@teol.net