Image sources:
Ertuğrul Anıl, 2011, 2018.
Google Earth, 2018.
Tayfun Bilgin, 2006, 2010, 2014, 2018.
Cüneyt Süer, 2011.
Ercüment Süer, 2011.
Bora Bilgin, 2006, 2011.
A. D. Riddle, 2011.
Metin Alparslan, AA 2013.
Heinrich Otten, MDOG 87, 1955.
Th. Beran, MDOG 93, 1962.
Peter Neve, AA 1980 and AA 1993.
Jürgen Seeher, AA 1997 and AA 2005.
Ali and Belkıs Dinçol, GsImparati, 2002.
(List of Abbreviations)