B. M. Wilson, ‘Dominion of the Ear: Singing the Vernacular in Piazza San Martino’ Dickinson College Faculty, Publications, paper 88, 2013, p. 274. Available at
http://scholar.dickinson.edu/faculty_publications/88, (accessed 20 January 2015), cites W. Limburger, Die Gebäude von Florenz, Architekten, Strassen und Plätze in Alphabetischen Verzeichnissen, Leipzig, F. A. Brockhaus, 1910, appendix which mentions the ‘seconda piazzuola di San Martino’ being the small space where the entrance to the Buonomini’s oratory is found.