A good friend of mine, Ming, asked me to recommend a couple of books on the topic of Antitrust. Here's my list:
For Antitrust Law in General
1) Dick Ponser, Antitrust Law, 2nd edition, U of Chicago Press.
2) Herbert Hovenkamp, The Antitrust Enterprise: Principle and Execution, Harvard U Press.
3) Bob Bork, The Antitrust Paradox, Free Press. A bit dated, but still the book to go to for standard reference.
4) Massimo Motto, Competition Policy: Theory and Practice, Cambridge U Press.
5) Keith Hylton, Antitrust Law: Economic Theory and Common Law Evolution, Cambridge U Press.
For Public Choice Perspective
6) Bill Shughart, Antitrust Policy and Interest Group Politics, Quorum Press.
7) Fred McChesney and Bill Shughart edited, The Causes and Consequences of Antitrust: The Public Choice Perspective, U of Chicago Press.
For Austrian Perspective
8) Dominick Armentano, Antitrust and Monopoly, Independent Institute.
For Textbook Treatment
9) Roger Sherman, Market Regulation, Addison Wesley.
10) Roger Blair etal. Antitrust Economics, Oxford U Press.