Cita APA (7a ed.)

Heiken, G., De Rita, D., & Funiciello, R. (2007). The Seven Hills of Rome: A Geological Tour of the Eternal City. Princeton University Press.

Cita Chicago Style (17a ed.)

Heiken, Grant, Donatella De Rita, y R. Funiciello. The Seven Hills of Rome: A Geological Tour of the Eternal City. Woodstock: Princeton University Press, 2007.

Cita MLA (8a ed.)

Heiken, Grant, et al. The Seven Hills of Rome: A Geological Tour of the Eternal City. Princeton University Press, 2007.