The Roman imperial coinage - Bruun, Patrick M.; Carson, R. A. G. (Robert Andrew Glindinning), 1918-; Kent, John Philip Cozens; Mattingly, Harold 1884-1964; Pearce, J. W. E.; Sutherland, C. H. V. (Carol Humphrey Vivian), 1908-1986; Sydenham, Edward Allen, 1873-1948; Webb, Percy H. (Spink and Son, 1984)