APA (7th ed.) Citation

Wright, J. D., Potts, J., & Humphries, C. (2004). Philip's guide to the state of the world. Philip's.

Chicago Style (17th ed.) Citation

Wright, John D., Joanna Potts, and Christian Humphries. Philip's Guide to the State of the World. London: Philip's, 2004.

MLA (9th ed.) Citation

Wright, John D., et al. Philip's Guide to the State of the World. Philip's, 2004.