APA (7th ed.) Citation

Corbishley, M., & Walker, R. W. (2015). Secret cities. Pila Books Limited.

Chicago Style (17th ed.) Citation

Corbishley, Mike, and Roger Wade Walker. Secret Cities. Orpington, Kent: Pila Books Limited, 2015.

MLA (8th ed.) Citation

Corbishley, Mike, and Roger Wade Walker. Secret Cities. Pila Books Limited, 2015.