Journal Article:
Da Costa Kaufmann, Thomas (1975). ‘The Perspective of Shadows: The History of the Theory of Shadow Projection’. Journal of the Warburg and Courtauld Institutes Vol. 38, 281
Journal Article:
Kemp, Martin (1978). ‘SCIENCE, NON‐SCIENCE AND NONSENSE: The Interpretation of Brunelleschi’s Perspective’. Art History, Volume 1 Issue 2, (Page numbers could not be verified)