Simpson, James Y. (1872). "Was the Roman Army provided with medical officers?". In Stuart, John (ed.). Archaeological Essays by the late Sir James Y. Simpson, Volume 2. Edinburgh: Edmonston and Douglas. pp. 196–227.
Simpson, James Y. Stuart, John (ed.). Archaeological Essays by the late Sir James Y. Simpson, Volume 2. Edinburgh: Edmonston and Douglas. Volume 1; Volume 2