Frankau, Julia; Smith, John Raphael [Ill.]: An eighteenth century artist and engraver: John Raphael Smith; his life and works (London: Macmillan, 1902)

PORTRAITS OF THEIR HIGHNESSES WILLIAM
FREDERICK, WILLIAM GEORGE FREDERICK, &
FREDERICA LOUISA WILHELMINA, PRINCES
& PRINCESS OF ORANGE AND NASSAU.
Painted by Tischbein Portrait Painter to bis Serene Higbnefs the Prince of
Waldeck. From a Picture in the Pofsefsion of Her Royal Higbnefs
the Princefs of Orange & Nassau &c. &c. Engraved by
J. R. Smith Mesczotinto Engraver to his Royal Higbnefs
the Prince of Wales, &c. &c.