Columbia subject headings:
Harvard subject headings:
Vrettakos, Nikēphoros, 1911-1991--Bibliography.
Vrettakos, Nikēphoros, 1911-1991.
Vrettakou-Apostolidou, Kalliopē.
Princeton subject headings:
Vrettakos, Nikēphoros, 1911-1991--Bibliography.
Vrettakos, Nikēphoros, 1911-1991.
Vrettakou-Apostolidou, Kalliopē.