APA (7th ed.) Citation

Gibbon, E. (1962). Barbarism and the fall of Rome. Collier Books.

Chicago Style (17th ed.) Citation

Gibbon, Edward. Barbarism and the Fall of Rome. New York: Collier Books, 1962.

MLA (9th ed.) Citation

Gibbon, Edward. Barbarism and the Fall of Rome. Collier Books, 1962.