Britannica, IstanbulDiarsipkan 2007-12-18 di Wayback Machine.:When the Republic of Turkey was founded in 1923, the capital was moved to Ankara, and Constantinople was officially renamed Istanbul in 1930.
web.archive.org
Britannica, IstanbulDiarsipkan 2007-12-18 di Wayback Machine.:When the Republic of Turkey was founded in 1923, the capital was moved to Ankara, and Constantinople was officially renamed Istanbul in 1930.