1. ‘United States of Al’ Canceled By CBS After 2 Seasons  Deadline
2. ‘United States of Al’ Cancelled at CBS, Not Returning for Season 3  TVLine
3. CBS Cancels Sitcom After Two Seasons  ComicBook.com
4. Chuck Lorre’s ‘United States of Al’ Canceled at CBS  Hollywood Reporter
5. CBS cuts diplomatic ties with the United States Of Al  The A.V. Club

Source: Google Finance – Market News