Cita APA (7th ed.)
Gallup, G., & O'Connell, G. (1986). Who do Americans say that l am ? Westminster.
Cita Chicago (17th ed.)
Gallup, George, i George O'Connell. Who Do Americans Say That L Am ? Philadelphia: Westminster, 1986.
Cita MLA (9th ed.)
Gallup, George, i George O'Connell. Who Do Americans Say That L Am ? Westminster, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.