Eitel-Porter, Rhoda. Artistic Co-Operation in Late Sixteenth-Century Rome: The Sistine Chapel in S. Maria Maggiore and the Scala Santa. The Burlington Magazine. 1997: 452–462.
Ewart Witcombe, Christopher L. C. Sixtus V and the Scala Santa. The Journal of the Society of Architectural Historians. 1985: 368–379.