Eder, "The Augustan Principate as Binding Link," in Between Republic and Empire (University of California Press, 1993), p.
Nicolet, Space, Geography, and Politics in the Early Roman Empire, pp. 1, 15; Olivier Hekster and Ted Kaizer, preface to Frontiers in the Roman World. Proceedings of the Ninth Workshop of the International Network Impact of Empire (Durham, 16–19 April 2009) (Brill, 2011), p. viii; Andrew Lintott, The Constitution of the Roman Republic (Oxford University Press, 1999), p. 114; W. Eder, "The Augustan Principate as Binding Link," in Between Republic and Empire (University of California Press, 1993), p. 98.