The Oxford Guide to the United States Goverment

 Patrick, John J.; Pious, Richard M; Ritchie, Donald;

New York : Oxford University Press , 2001

War in a time of peace :Bush, Clinton, and the Generals

 Halberstam, David;

New York : Scribner , 2001

Understanding the presidency

 Pfiffner, james P.; Davidson, Roger H.;

ew York : Longman , 2002

American goverment

 Wilson, James Q.;

Boston : Houghton Miflin Company , 2003