Amsterdam, 18 January 1956 - Transport documents Hans Ludwig Cohn Jaffé's letter to Holland-Amerika Lijn
Amsterdam, 17 October 1956 - Institutional correspondence A letter from Hans Ludwig Cohn Jaffé's to the editors of the newspaper De Tijd
Museo Nacional Centro de Arte Reina Sofía, Madrid, October 19, 2018 - Interview Francis Frascina in conversation with Lucy Lippard