Knut Nicolaus (Nicolaus, Knut)

German

• 
  via
  DuMont's Bild-Lexikon Zur Gemaldebestimmung
  by Knut Nicolaus
  Hardcover, DuMont, ISBN 3770112431 (3-7701-1243-1)
• 
  via
  DuMonts Handbuch der Gemäldekunde
  by Knut Nicolaus
  Softcover, ISBN 3832172882 (3-8321-7288-2)

English

• 
  via
  Restoration of Paintings
  by Knut Nicolaus
  Softcover, Konemann, ISBN 3895089222 (3-89508-922-2)

  More editions of Restoration of Paintings:

  • The Restoration of Paintings: Hardcover, Konemann, ISBN 3895089966 (3-89508-996-6)

Spanish

• 
  Restauracion De Cuadros
  by Knut Nikolaus
  Hardcover, Trucatriche, ISBN 3895086495 (3-89508-649-5)