Gaya APA

Boyce, D, G., O'Day, A. (2001). Defenders of the union : a survey of British and irish unionism since 1801 . London: Routledge.

Gaya MLA

Boyce, D., George., O'Day, Alan. "Defenders of the union : a survey of British and irish unionism since 1801". London: Routledge, 2001. Text.