APA (7th ed.) Citation

Vallely P. Paul, Trewin S. Simon, & Gorman P. Paul. (2005). Hello World: The official book. London, Century, 2005.

Chicago Style (17th ed.) Citation

Vallely P. Paul, Trewin S. Simon, and Gorman P. Paul. Hello World: The Official Book. London, Century, 2005, 2005.

MLA (9th ed.) Citation

Vallely P. Paul, et al. Hello World: The Official Book. London, Century, 2005, 2005.