Text in periodical
Miller, Barbara. – «Vancouver, British Columbia». – Art Papers. – Vol. 28, no. 2 (Mar./Apr. 2004). – P. 61.
Archive document : Manuscript
Smedley, Geoffrey. – Piero della Francesca & mathematical humanism at urbino. – [Gibsons : G. Smedley], 2003. – 26 p. – Manuscript. – Text of a conference read in the context of the the exhibition «Sphere», 2003.