APA
O'Halpin E., . (1999). Defending Ireland : the Irish state and its enemies since 1922. Oxford: Oxford University Press.
Chicago
O'Halpin Eunan, . 1999. Defending Ireland : the Irish state and its enemies since 1922. Oxford: Oxford University Press.
Harvard
O'Halpin E., . (1999). Defending Ireland : the Irish state and its enemies since 1922. Oxford: Oxford University Press.
MLA
O'Halpin Eunan, . Defending Ireland : the Irish state and its enemies since 1922. Oxford: Oxford University Press. 1999.