APA (7th ed.) Citation

GIBBON, E. (1963). The decline and fall of the Roman empire. Penguin, Books.

Chicago Style (17th ed.) Citation

GIBBON, Edward. The Decline and Fall of the Roman Empire. Harmondsworth: Penguin, Books, 1963.

MLA (9th ed.) Citation

GIBBON, Edward. The Decline and Fall of the Roman Empire. Penguin, Books, 1963.