Alan (Eagleton Institute of Politics, Rutgers University) Rosenthal 
The Third House : Lobbyists and Lobbying in the States [PDF ebook] 
Lobbyists and Lobbying in the States

The book, which has drawn praise for its inviting and accessible style, thoroughly examines the lobbying scene: the settings in which lobbying takes place, the types and styles of lobbyists, the broad range of approaches and techniques used by lobbyists, and the role and influence of lobbying in our system of representative democracy. A favorite among professors and students alike, The Third House is a great choice as a supplement for courses on state politics or interest groups.