Columbia subject headings:
Fasts and feasts--Islam.
Fasts and feasts--Turkey--Istanbul--History.
Istanbul (Turkey)--History.
Harvard subject headings:
Fasts and feasts--Islam
Fasts and feasts--Turkey--Istanbul--History.
Istanbul (Turkey)--History
Princeton subject headings:
Fasts and feasts--Islam.
Fasts and feasts--Turkey--Istanbul--History.
Istanbul (Turkey)--History.