Elsie & Mathie-Heck 2004, էջ. xvi: "From this and from conspicuous Slavic terms in some of the songs, it would seem evident that we are dealing with the body of oral material which, probably after centuries of evolution, crystallized in a southern Slavic milieu and which was then transmitted by bilingual singers to (some would say back to) an Albanian milieu." Elsie, Robert; Mathie-Heck, Janice (2004). Songs of the Frontier Warriors. Wauconda, Illinois: Bolchazy-Carducci Publishers, Incorporated. ISBN0-86516-412-6.
Elsie & Mathie-Heck 2004, էջ. xvii: "Despite transmission from a Bosnian Slav milieu, the Songs of Frontier Warriors are by no means simply translations of Serbo-Croatian epic verse. They have undergone continuous and independent evolution since the period of crystallization and are thus neither Bosnian, Montenegrin, Hercegovine, Serb, nor southern Albanian for that matter, but a product of the creative genius of the northern Albanian highlands." Elsie, Robert; Mathie-Heck, Janice (2004). Songs of the Frontier Warriors. Wauconda, Illinois: Bolchazy-Carducci Publishers, Incorporated. ISBN0-86516-412-6.
