Are you looking for relatives or the location of his grave?Unfortunately the Bosnia online phone book is no longer available on the internet.
You could contact the church with which he was affilated and perhaps they can help you.If you let me know what his religion was and the town where he lived most likely I can find an address and phone number for you.Or maybe the Bosnian Embassy.
Bosnia and Herzegovina Embassy of Bosnia and Herzegovina Vacant, Ambassador 130 Albert St., Ste. 805 Ottawa, ON K1P 5G4
Phone: 613-236-0028 FAX: 613-236-1139
Contacts: Mr. Rade Palija, Minister-Counsellor and Chargé d'Affaires a.i.