↑Spencer, R.D., The Expert Versus the Object: Judging Fakes and False Attributions in the Visual Arts, Oxford University Press, 2004, [E-Book edition]
Dictionnaire Bénézit
Claude Marumo, Thomas Maier et Bernd Mullerschon, Paul Désiré Trouillebert (1831-1900), [catalogue raisonné], Stuttgart, 2004, 635 p., 1 200 ill. (ISBN3935252021).