Heiken, G., Funiciello, R., & De Rita, D. (2005). The seven hills of Rome: A geological tour of the eternal city. Princeton University Press.
Lua i Stíl Chicago (17ú heag.)Heiken, Grant, R. Funiciello, agus Donatella De Rita. The Seven Hills of Rome: A Geological Tour of the Eternal City. Princeton: Princeton University Press, 2005.
Lua MLA (9ú heag.)Heiken, Grant, et al. The Seven Hills of Rome: A Geological Tour of the Eternal City. Princeton University Press, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.