Cita APA (7th ed.)
Hopp, G. (2001). Billy Wilder. Pocket Essentials.
Cita Chicago (17th ed.)
Hopp, Glenn. Billy Wilder. Harpenden: Pocket Essentials, 2001.
Cita MLA (9th ed.)
Hopp, Glenn. Billy Wilder. Pocket Essentials, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.