APA (7th ed.) Citation

Arthur, P., Jeffery, K., & Arthur, P. (1988). Northern Ireland since 1968. Basil Blackwell.

Chicago Style (17th ed.) Citation

Arthur, Paul, Keith Jeffery, and Paul Arthur. Northern Ireland Since 1968. Oxford: Basil Blackwell, 1988.

MLA (9th ed.) Citation

Arthur, Paul, et al. Northern Ireland Since 1968. Basil Blackwell, 1988.