National, regional and minority languages in Europe. Frankfurt am Main, 2011. İSBN: 9783631603659. Contents: On the minority languages in Bulgaria, page 97–106Arxivləşdirilib 2023-07-03 at the Wayback Machine
National, regional and minority languages in Europe. Frankfurt am Main, 2011. İSBN: 9783631603659. Contents: On the minority languages in Bulgaria, page 97–106Arxivləşdirilib 2023-07-03 at the Wayback Machine