Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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