After a quick look-see I'd suggest these books (beside the one above):
Leslie Benson - Yugoslavia: A Concise History
Badredine Arfi - International Change and the Stability of Multiethnic States
Sabrina P Ramet - Balkan Babel (the Thinking About Yugoslavia also sounds good)
Stipe Mesic - The Demise of Yuogslavia
Ofc the more the better, at least in the Bibliography of the essay. Try to pick books with Serbo-Croatian author names, like that Mesic.