APA (7th ed.) Citation

D'Alton, J. (1830). Essay on the ancient history ... of Ireland.

Chicago Style (17th ed.) Citation

D'Alton, John. Essay on the Ancient History ... of Ireland. Dublin, 1830.

MLA (9th ed.) Citation

D'Alton, John. Essay on the Ancient History ... of Ireland. 1830.

Warning: These citations may not always be 100% accurate.