The almanac of American politics 2002: the senators, the representatives and the governors

 Barone, Michael; Cohen, Richard E.; Cook Jr., Charles E.;

Washington, D.C. : national Journal Group , 2001

Guide to congress

 A Division of Congressional Quarterly Inc.;

Washington, D.C. : CQ Press , 2000

Lobbying congress: how the system works

 Wolpe, Bruce C.; Levine, Bertram J.;

Washington, D.C. : CQ Press , 1996