Found in articles
першакрыніцы 1 чэрвеня 2012. Праверана 14 лютага 2010. Robert S. Nelson. Hagia Sophia, 1850-1950: Holy Wisdom Modern Monument. — Chicago: University of Chicago
p73 What was begun under Constantine and achieved under Justinian in Hagia Sophia reached its ultimate fulfilment in the work of the Armenian janissary(under