«Appendix 7 to Section IV – Three-letter codes». Doc 9303, Machine Readable Travel Documents, Part I – Machine Readable Passports, Volume I – Passports with Machine Readable Data Stored in Optical Character Recognition Format. International Civil Aviation Organization. pp. IV-43-IV-46.
«Appendix 7 to Section IV – Three-letter codes». Doc 9303, Machine Readable Travel Documents, Part I – Machine Readable Passports, Volume I – Passports with Machine Readable Data Stored in Optical Character Recognition Format. International Civil Aviation Organization. pp. IV-43-IV-46.
ISO International Organization for Standardization, ISO 3166 Maintenance Agency (1 de febrero de 2002). «RE: Change of alpha-3 Code Element». ISO 3166-1 NEWSLETTER No. V-3. Archivado desde el original el 22 de julio de 2011. Consultado el 26 de junio de 2017. «Description of change: Change of the alpha-3 Code element for Romania from ROM to ROU following a request of the Government of Romania.»
ISO International Organization for Standardization, ISO 3166 Maintenance Agency (1 de febrero de 2002). «RE: Change of alpha-3 Code Element». ISO 3166-1 NEWSLETTER No. V-3. Archivado desde el original el 22 de julio de 2011. Consultado el 26 de junio de 2017. «Description of change: Change of the alpha-3 Code element for Romania from ROM to ROU following a request of the Government of Romania.»