Robert Graves (1982). “Claudius the God and His Wife Messalina: The Troublesome Reign of Tiberius Claudius Caesar, Emperor of the Romans (born 10 B.C., Died A.D. 54), as Described by Himself, Also His Murder at the Hands of the Notorious Agrippina (mother of the Emperor Nero) and His Subsequent Deification, as Described by Others”
Robert Graves (2006). “The Long Weekend : a Social History of Great Britain 1918-1939: And, The Reader Over Your Shoulder : a Handbook for Writers of English Prose”, Carcanet Press