R.W. Davies, "The Abortive Invasion of Britain by Gaius", Historia 15 (1996), 124-128; See スエトニウス『ローマ皇帝伝』「カリグラ」 44
J.P.V.D. Balsdon, The Emperor Gaius (Caligula) (Oxford, 1934) 90-92; Troops were reluctant to go under Claudius in 43 as well, Cassius Dio, Roman HistoryLX.19