Christie, M. &. W., & Christie, M. &. W. (2018). Old master & British drawings & watercolours: Tuesday 3 July 2018 : properties from: the collection of Dr. Heinrich Becker (Bielefeld), the collection of the late William Drummond (F.S.A), the collection of the late James O. Fairfax AC, the collection of Ernst Holzscheiter, the collection of Dr. J.A.M. Smit, the collection of the late Baron Alain de Rothschild (1910-1982), the estate of Gwendolyn van Norden, the estate of Anthony Wingate. London: Christie's.

Christie, Manson & Woods, and Manson & Woods Christie. Old Master & British Drawings & Watercolours: Tuesday 3 July 2018 : Properties From: The Collection of Dr. Heinrich Becker (Bielefeld), the Collection of the Late William Drummond (F.S.A), the Collection of the Late James O. Fairfax AC, the Collection of Ernst Holzscheiter, the Collection of Dr. J.A.M. Smit, the Collection of the Late Baron Alain De Rothschild (1910-1982), the Estate of Gwendolyn Van Norden, the Estate of Anthony Wingate. London: Christie's, 2018.

Christie, Manson & Woods, and Manson & Woods Christie. Old Master & British Drawings & Watercolours: Tuesday 3 July 2018 : Properties From: The Collection of Dr. Heinrich Becker (Bielefeld), the Collection of the Late William Drummond (F.S.A), the Collection of the Late James O. Fairfax AC, the Collection of Ernst Holzscheiter, the Collection of Dr. J.A.M. Smit, the Collection of the Late Baron Alain De Rothschild (1910-1982), the Estate of Gwendolyn Van Norden, the Estate of Anthony Wingate. London: Christie's, 2018.