Cita APA (7a ed.)

Keur, C., & Hillegass, A. (2017). IOS PROGRAMMING: THE BIG NERD RANCH GUIDE (5th ed.). Big Nerd Ranch.

Cita Chicago Style (17a ed.)

Keur, Christian, y Aaron Hillegass. IOS PROGRAMMING: THE BIG NERD RANCH GUIDE. 5th ed. Atlanta, GA: Big Nerd Ranch, 2017.

Cita MLA (9a ed.)

Keur, Christian, y Aaron Hillegass. IOS PROGRAMMING: THE BIG NERD RANCH GUIDE. 5th ed. Big Nerd Ranch, 2017.