Columbia subject headings:
Gevrekzâde Hâfız Hasan Efendi, 1727-1801.
Music therapy--Turkey--History.
Physicians--Turkey--Biography.
Harvard subject headings:
Gevrekzâde Hâfız Hasan Efendi, 1727-1801.
Music therapy--Turkey--History.
Physicians--Turkey--Biography
Princeton subject headings:
Gevrekzâde Hâfız Hasan Efendi, 1727-1801.
Music therapy--Turkey--History.
Physicians--Turkey--Biography.