Columbia subject headings:
Knupfer, Nicolaus, 1603 or 1609-1655--Catalogues raisonnés.
Knupfer, Nicolaus, 1603 or 1609-1655.
Painters--Netherlands--Biography.
Painting, Dutch--17th century.
Harvard subject headings:
Knupfer, Nicolaus, 1603 or 1609-1655--Catalogues raisonnés.
Knupfer, Nicolaus, 1603 or 1609-1655--Criticism and interpretation.
Princeton subject headings:
Catalogues raisonnés.
Knupfer, Nicolaus, 1603 or 1609-1655--Catalogues raisonnés.
Knupfer, Nicolaus, 1603 or 1609-1655.
Painters--Netherlands--Biography.
Painting, Dutch--17th century.