Organisation for Economic Co-operation and Development. March 2008. ISBN 978-92-64-04383-1. "Forum of Constantine". www.byzantium1200.com. Retrieved 31 January...
Organisation for Economic Co-operation and Development. March 2008. ISBN 978-92-64-04383-1. {{cite book}}: |work= ignored (help) Turan 2010, p. 224 "Population...