After your casebook, "Casenotes" will be your most important reference source for the entire semester. It is the most popular legal briefs series available, with over 140 titles, and is relied on by thousands of students for its expert case summaries, comprehensive analysis of concurrences and dissents, as well as of the majority opinion in the briefs.
useful introduction to the basic problems of public international law. one quarter of my lawyer schooling was international law, but I haven't had any international law questions as a professional. so, yaknow, very expensive pleasure reading, apparently.