Bulgarian.Archived 2016-03-03 at the वेबैक मशीन Report on the Current Status of United Nations Romanization Systems for Geographical Names. Compiled by the UNGEGN Working Group on Romanization Systems. Version 4.0, February 2013.
Bulgarian.Archived 2016-03-03 at the वेबैक मशीन Report on the Current Status of United Nations Romanization Systems for Geographical Names. Compiled by the UNGEGN Working Group on Romanization Systems. Version 4.0, February 2013.