Columbia subject headings:
Portraits--History--20th century.
Portraits--History--21st century.
Portraits--Philosophy--Exhibitions.
Portraits--Psychological aspects--Exhibitions.
Harvard subject headings:
Portraits--History--20th century--Exhibitions.
Portraits--History--21st century--Exhibitions.
Portraits--Philosophy--Exhibitions.
Portraits--Psychological aspects--Exhibitions.
Princeton subject headings:
Art, Modern--20th century--Exhibitions.
Art, Modern--21st century--Exhibitions.
Portraits--Exhibitions.