APA (7th ed.) Citation

Barker, A., Redfern, D., & Skinner, M. (2006). Advanced Geography: AQA B. Philip Allan Updates.

Chicago Style (17th ed.) Citation

Barker, Amanda, David Redfern, and Malcolm Skinner. Advanced Geography: AQA B. London: Philip Allan Updates, 2006.

MLA (9th ed.) Citation

Barker, Amanda, et al. Advanced Geography: AQA B. Philip Allan Updates, 2006.