Cita APA (7th ed.)

O'Brien, D. (1949). History of the O'Briens from Brian Boroimhe, AD.1000 to AD.1945. Batsford.

Cita Chicago (17th ed.)

O'Brien, Donough. History of the O'Briens from Brian Boroimhe, AD.1000 to AD.1945. Lond.: Batsford, 1949.

Cita MLA (8th ed.)

O'Brien, Donough. History of the O'Briens from Brian Boroimhe, AD.1000 to AD.1945. Batsford, 1949.