1. Extraterrestrial Cause for the Cretaceous-Tertiary Extinction
2. 1973. The vicissitudes of the gastropods during the interval of Guadalupian-Ladinian time. In The Permian and Triassic Systems and their Mutual Boundary, (eds). Canadian Society of Petroleum Geologists, Memoir 2: 596-607.
3. 1994. Late Triassic to Middle Jurassic extinctions among continental tetrapods: testing the patterns. In In the Shadow of the Dinosaurs, (eds). Cambridge University Press: Cambridge; 366-397.