You do not have to buy each one of them. You probably should buy Kingdon, Goodsell, and perhaaps Loomis. However for the others, you may want to share a book with a friend or check it out from a library. All of them except Rourke are available from the bookstore. Selected chapters in folders for two libraries.
Relevant chapters are in folders in the two relevant libraries.
Look under both POLI 219 and PADM 219 in bookstore before giving up. Also Kingdon is assigned for other political science classes, so ask a bookstore person to get you another copy if necessary. 31 Read esp. Agenda Setting Reading - Kingdon, remaining chapters. Lecturer Phil Boyle Reading - Stone Ch.