APA (7th ed.) Citation

Arthur, P., & Jeffery, K. (1996). Northern Ireland since 1968 (2nd ed.). Blackwell.

Chicago Style (17th ed.) Citation

Arthur, Paul, and Keith Jeffery. Northern Ireland Since 1968. 2nd ed. Oxford [etc.]: Blackwell, 1996.

MLA (9th ed.) Citation

Arthur, Paul, and Keith Jeffery. Northern Ireland Since 1968. 2nd ed. Blackwell, 1996.