Columbia subject headings:
Dervishes--Turkey--Istanbul.
Religious institutions--Turkey--Istanbul.
Sufis--Turkey--Istanbul.
Sufism--Turkey--Istanbul--History.
Harvard subject headings:
Dervishes--Turkey--Istanbul.
Istanbul (Turkey)--Religious institutions.
Sufis--Turkey--Istanbul.
Sufism--Turkey--Istanbul--History.
Princeton subject headings:
Dervishes--Turkey--Istanbul.
Istanbul (Turkey)--Buildings, structures, etc.
Religious institutions--Turkey--Istanbul.
Sufis--Turkey--Istanbul.
Sufism--Turkey--Istanbul--History.