^Bart Plantenga. Yodel-ay-ee-oooo. Routledge, 2004. ISBN978-0-415-93990-4, p. 87 Albania: "Singers in Pogoni region perform a style of polyphony that is also practised by locals in Vlach and Slav communities [in Albania].
^Engendering Song: Singing and Subjectivity at Prespa by Jane C. Sugarman,1997,ISBN0-226-77972-6,page 356,"Neither of the polyphonic textures characteristic of south Albanian singing is unique to Albanians.The style is shared with Greeks in the Northwestern district of Epirus (see Fakiou and Romanos 1984) while the Tosk style is common among Aromanian communities from the Kolonje region of Albania the so called Faserotii (see Lortat-Jacob and Bouet 1983) and among Slavs of the Kastoria region of Northern Greece (see N.Kaufamann 1959 ). Macedonians in the lower villages of the Prespa district also formerly sang this style "
^Engendering Song: Singing and Subjectivity at Prespa by Jane C. Sugarman,1997,ISBN0-226-77972-6,page 356,A striking counterpart from outside the Balkans is the polyphonic Yodeling of juuzli from the Muotatal region of Switzerland