APA
Ritchie D. A., . (2010). The U.S. Congress : a very short introduction. Oxford: Oxford University Press.
Chicago
Ritchie Donald A, . 2010. The U.S. Congress : a very short introduction. Oxford: Oxford University Press.
Harvard
Ritchie D. A., . (2010). The U.S. Congress : a very short introduction. Oxford: Oxford University Press.
MLA
Ritchie Donald A, . The U.S. Congress : a very short introduction. Oxford: Oxford University Press. 2010.