Alina A. Payne, 1999
Architectural Criticism, Science, and Visual Eloquence: Teofilo Gallaccini in
Seventeenth-Century Siena
Journal of the Society of Architectural Historians Vol. 58, No. 2: p. 156, 167
Robin Evans, 1992
WHEN THE VANISHING-POINT DISAPPEARS
AA Files No. 23: p. 6,17