Cita APA (7a ed.)

Ritchie, D. A. (2010). The U.S. Congress: A very short introduction. Oxford University Press.

Cita Chicago Style (17a ed.)

Ritchie, Donald A. The U.S. Congress: A Very Short Introduction. Oxford [etc.]: Oxford University Press, 2010.

Cita MLA (9a ed.)

Ritchie, Donald A. The U.S. Congress: A Very Short Introduction. Oxford University Press, 2010.