Madrid, 17 February 1986 - Institutional correspondence Letter from Justino Azcárate to Carmen Crespo
Estudios sobre el mensaje periodístico, vol. 16, 2010 - Magazines «This is not Guernica…» Press photos from the destruction of Guernica during Spanish Civil War
10 January 1998 - Newspapers Experts from major museums around the world analyse the conservation of "Guernica"