Cita APA (7th ed.)
Kyle Richter. Beginning iOS Game Center and Game Kit: For iPhone, iPad, and iPod touch. Apress.
Cita Chicago (17th ed.)
Kyle Richter. Beginning IOS Game Center and Game Kit: For IPhone, IPad, and IPod Touch. Berkeley, EUA: Apress.
Cita MLA (9th ed.)
Kyle Richter. Beginning IOS Game Center and Game Kit: For IPhone, IPad, and IPod Touch. Apress.
Atenció: Aquestes cites poden no estar 100% correctes.