Working Group on Romanization Systems.WGRS websiteArchived 18 January 2008 at the Wayback Machine. United Nations Group of Experts on Geographical Names.
Kerfoot, Helen / Närhi, Eeva Maria: Toponymic guidelines for map and other editors, for international use (from the 1970s to the present). In: Manual for the national standardization of geographical names United Nations Group of Experts on Geographical Names United Nations. New York: United Nations, 2006: pp. 143–152. Online: http://unstats.un.org/unsd/publication/seriesm/seriesm_88e.pdfArchived 21 January 2024 at the Wayback Machine
Working Group on Romanization Systems.WGRS websiteArchived 18 January 2008 at the Wayback Machine. United Nations Group of Experts on Geographical Names.
Kerfoot, Helen / Närhi, Eeva Maria: Toponymic guidelines for map and other editors, for international use (from the 1970s to the present). In: Manual for the national standardization of geographical names United Nations Group of Experts on Geographical Names United Nations. New York: United Nations, 2006: pp. 143–152. Online: http://unstats.un.org/unsd/publication/seriesm/seriesm_88e.pdfArchived 21 January 2024 at the Wayback Machine