APA (7th ed.) Citation

O'Brien, C. C. (1973). States of Ireland. Vintage Books.

Chicago Style (17th ed.) Citation

O'Brien, Conor Cruise. States of Ireland. New York: Vintage Books, 1973.

MLA (9th ed.) Citation

O'Brien, Conor Cruise. States of Ireland. Vintage Books, 1973.

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