Radic, Vesna, Eight Centuries of the Serbian Dinar: Medieval Coins, National Museum, Belgrade, 1994, 55 pages, 10 plates, softcover. A nice catalog that accompanied an exhibit of medieval Serbian coins. Completely bilingual (Serbian and English), with full coin descriptions and nice photos. Not as complete as Jovanovich, but useful, ex James Farr Collection Library.
Estimate: 10-20 USD