APA

Patrick J., Pious R. & Ritchie D. (2001). The Oxford Guide to the United States Government. Oxford: Oxford Universitu Press.

Chicago

Patrick J.J, Pious R.M and Ritchie D.A. 2001. The Oxford Guide to the United States Government. Oxford: Oxford Universitu Press.

Harvard

Patrick J., Pious R. and Ritchie D. (2001). The Oxford Guide to the United States Government. Oxford: Oxford Universitu Press.

MLA

Patrick J.J, Pious R.M and Ritchie D.A. The Oxford Guide to the United States Government. Oxford: Oxford Universitu Press. 2001.