icon king1 on freeicons.io -- JSON and CSV download icons ( Link )
Joseph Sardin on Big Sound Bank -- sound effects for flashcards ( Link )
Miljka Kajganić -- Kordun Regionalisms as listed in Crkva na Točkovima ( About Miljka & Crkva )
Vladislava Ribnikar and David Norris -- Vocabulary from Teach Yourself Serbian ( Link )