Cita APA (7a ed.)

Welch, K. (2014). Mastering iOS development: In App purchasing. InfiniteSkills.

Cita Chicago Style (17a ed.)

Welch, Keith. Mastering IOS Development: In App Purchasing. [Place of publication not identified]: InfiniteSkills, 2014.

Cita MLA (8a ed.)

Welch, Keith. Mastering IOS Development: In App Purchasing. InfiniteSkills, 2014.