found: Ertz, K. Jan Breughel der Jüngere (1601-1678), 1984:t.p. (Jan Breughel der Jüngere, 1601-1678) p. 13, etc. (Jan Brueghel; sometimes spelled Bruegel; d. 9/1/1678)
found: Thieme-Becker(Bruegel, Jan, d.J.; bapt. 9/13/1601, d. 9/1/1678; also spelled Breughel and Brueghel)
found: Nagler Kunstlex.,v. 2, p. 178 (Breughel, Johann)
found: Benezit, Dict. des Peintres ...v. 2, p. 348 (Brueghel (Jan II), bapt. 9/13/1601, d. 9/1/1678; also spelled Bruegel, Breughel)
found: Encyc. Americana(Bruegel ... Jan the Younger (1601-1678) also spelled Brueghel)
found: Gr. Winkl. Prins(Bruegel, also Brueghel or Breughel, Jan II, de Jongere)
notfound: Encyc. Britannica (has others under Brueghel and Bruegel);Colliers (only lists grandfather, Pieter Brueghel the Elder)