“Most of these take a strong stand and present a case either for or against impact theory. In my opinion, the best of the pro-impact books is James Lawrence Powell's Night Comes to the Cretaceous (New York: W. H. Freeman, 1998). The case against the impact theory is vigorously argued by Charles Officer and Jake Page in The Great Dinosaur Extinction Controversy (Reading, MA: Helix Books, 1996).”