Fig 1- Plan of one of the contraforti, shewing the arrangement of the stair-cases Fig 2- Transverse section of ditto Fig - Stuart James & Revett Nicholas - 1816, 1794

James stuart & nicholas revett. The antiquities of athens measured and delineated by james stuart f. R. S. And f. S. A. And nicholas revett painters and αrchitects, vol. Iii (ed. Willey reveley), london, john nichols, 1794. Date: 1794.