APA (7th ed.) Citation

Brown, G. M., Bevan, A., & Murray, B. (1999). Northern lights: A poet's sources. John Murray.

Chicago Style (17th ed.) Citation

Brown, George Mackay, Archie Bevan, and Brian Murray. Northern Lights: A Poet's Sources. London: John Murray, 1999.

MLA (9th ed.) Citation

Brown, George Mackay, et al. Northern Lights: A Poet's Sources. John Murray, 1999.