APA (7th ed.) Citation

Barker, J., & Barker, J. [. (2005). 100 great cities of the world. AA Publishing.

Chicago Style (17th ed.) Citation

Barker, Jack, and Jack [et...al] Barker. 100 Great Cities of the World. UK: AA Publishing, 2005.

MLA (9th ed.) Citation

Barker, Jack, and Jack [et...al] Barker. 100 Great Cities of the World. AA Publishing, 2005.

Warning: These citations may not always be 100% accurate.