Columbia subject headings:
Istanbul (Turkey)--History--Siege, 1453--Early works to 1800.
Harvard subject headings:
Barbaro, Nicolò, active 15th century--Diaries.
Istanbul (Turkey)--History--Siege, 1453--Early works to 1800.
Princeton subject headings:
Istanbul (Turkey)--History--Siege, 1453--Early works to 1800.