The Augustan empire 44 b. C.-a.C. 70 - Cook, Stanley Arthur; Adcock, Frank Ezra; Charlesworth, Martin Percival; Strong, Eugénie; Oertel, F.; Bell, H. Idris; Jomes, Henry; Collingwood, R.G; Anderson, J.G.C; Last, Hugh; Syme, R.; Nock, Arthur Darby; et al. (The Cambridge University, 1952)