Britannica, IstanbulArchived 2007-12-18 at the 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.
ibrahimpazan.com
PAZAN, İbrahim (August 17, 2015). "Kişisel Resmi Web Sitesi". Dr. İbrahim Pazan (in Turkish). Retrieved March 9, 2022.
Britannica, IstanbulArchived 2007-12-18 at the 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.