Christie's, & Christie's. (2018). Old masters: Thursday, 19 April 2018 : properties from: property of La Salle University, property returned to the heirs of Fritz Gutmann, property of the trustees of 4th Viscount Allendale, property from the estate of Mr. Gerard Arnhold. New York, NY: Christie's.

Christie's, und Christie's. Old Masters: Thursday, 19 April 2018 : Properties From: Property of La Salle University, Property Returned to the Heirs of Fritz Gutmann, Property of the Trustees of 4th Viscount Allendale, Property From the Estate of Mr. Gerard Arnhold. New York, NY: Christie's, 2018.

Christie's, und Christie's. Old Masters: Thursday, 19 April 2018 : Properties From: Property of La Salle University, Property Returned to the Heirs of Fritz Gutmann, Property of the Trustees of 4th Viscount Allendale, Property From the Estate of Mr. Gerard Arnhold. New York, NY: Christie's, 2018.