Balkan Syntax and Semantics, John Benjamins Publishing, 2004, ISBN158811502X, The typology of Balkan evidentiality and areal linguistics, Victor Friedman, p. 123.
Gröschel, Bernhard (2009). Das Serbokroatische zwischen Linguistik und Politik: mit einer Bibliographie zum postjugoslavischen Sprachenstreit [Serbo-Croatian Between Linguistics and Politics: With a Bibliography of the Post-Yugoslav Language Dispute]. Lincom Studies in Slavic Linguistics; vol 34 (in German). Munich: Lincom Europa. p. 265. ISBN978-3-929075-79-3. LCCN2009473660. OCLC428012015. OL15295665W.
Gröschel, Bernhard (2009). Das Serbokroatische zwischen Linguistik und Politik: mit einer Bibliographie zum postjugoslavischen Sprachenstreit [Serbo-Croatian Between Linguistics and Politics: With a Bibliography of the Post-Yugoslav Language Dispute]. Lincom Studies in Slavic Linguistics; vol 34 (in German). Munich: Lincom Europa. p. 265. ISBN978-3-929075-79-3. LCCN2009473660. OCLC428012015. OL15295665W.
Friedman, Victor (1999). Linguistic emblems and emblematic languages: on language as flag in the Balkans. Kenneth E. Naylor memorial lecture series in South Slavic linguistics; vol. 1. Columbus, Ohio: Ohio State University, Dept. of Slavic and East European Languages and Literatures. p. 8. OCLC46734277.
Alexander, Ronelle (2000). In honor of diversity: the linguistic resources of the Balkans. Kenneth E. Naylor memorial lecture series in South Slavic linguistics; vol. 2. Columbus, Ohio: Ohio State University, Dept. of Slavic and East European Languages and Literatures. p. 4. OCLC47186443.
Friedman, Victor (2003). "Language in Macedonia as an Identity Construction Site". In Brian, D. Joseph; et al. (eds.). When Languages Collide: Perspectives on Language Conflict, Language Competition, and Language Coexistence. Columbus: Ohio State University Press. pp. 261–262. OCLC50123480.
Bunčić, Daniel (2008). "Die (Re-)Nationalisierung der serbokroatischen Standards" [The (Re-)Nationalisation of Serbo-Croatian Standards]. In Kempgen, Sebastian (ed.). Deutsche Beiträge zum 14. Internationalen Slavistenkongress, Ohrid, 2008. Welt der Slaven (in German). Munich: Otto Sagner. p. 93. OCLC238795822.
Gröschel, Bernhard (2009). Das Serbokroatische zwischen Linguistik und Politik: mit einer Bibliographie zum postjugoslavischen Sprachenstreit [Serbo-Croatian Between Linguistics and Politics: With a Bibliography of the Post-Yugoslav Language Dispute]. Lincom Studies in Slavic Linguistics; vol 34 (in German). Munich: Lincom Europa. p. 265. ISBN978-3-929075-79-3. LCCN2009473660. OCLC428012015. OL15295665W.
Кочев (Kochev), Иван (Ivan) (2001). Български диалектен атлас (Bulgarian dialect atlas) (in Bulgarian). София: Bulgarian Academy of Sciences. ISBN954-90344-1-0. OCLC48368312.