Columbia subject headings:
Hockney, David--Exhibitions.
Hockney, David--Friends and associates--Portraits--Exhibitions.
Harvard subject headings:
Hockney, David--Exhibitions.
Hockney, David--Friends and associates--Portraits--Exhibitions.
Portrait drawing, English--20th century--Exhibitions.
Portrait painting, English--20th century--Exhibitions.
Princeton subject headings:
Hockney, David--Exhibitions.
Hockney, David--Friends and associates--Exhibitions.