Forsythe, Gary (2005). A critical history of early Rome. Berkeley: University of California Press. p. 279. ISBN978-0-520-94029-1. OCLC70728478.
Cornell, Tim (1995). The beginnings of Rome. London: Routledge. p. 73. ISBN0-415-01596-0. OCLC31515793. Varro likely arrived at 753 BC by counting seven generations of 35 years from his date for the founding of the republic in 509 BC.