Colliers Encyc. (Matthias Grünewald or Mathis Gothardt Neithardt; acc. to new scholarship real name was Mathis Gothart, called Neithardt)
Encyc. Americana (Grünewald, Mathis, d. 1528; b. between 1455 and 1483 as Mathis Neithardt; Grünewald a later sobriquet)
Encyc. Brit. (Grünewald, Matthias, real name Mathis Gothardt; occasionally added wife's surname Neithardt to his own)
Groveart WWW site, Sept. 4, 2003 (Grünewald, Matthias (Gothart Nithart, Mathis; Gothardt-Neithardt, Matthis); b. ca. 1475-1480, ?Würzburg, d. Aug. 30 or 31, 1528, Halle; German painter, draughtsman, hydraulic engineer, and architect)
Meister Mathis der Maler, 2005 p. 43 (Meister Mathis Maler)
Nagler, v. 6, p. 150-151 (Grünwald, Mathias; used M.G. so identity not certain)
Thieme-Becker, v. 15, p. 134 (Grünewald, Matthias; Mathis, Matthaeus, Mathes)