1. Jurassic geology of the world;Arkell,1956
2. Jurassic geology of the world;Arkell,1956
3. Evolutionary patterns in the Paleozoic Bivalvia;Bretsky,1973
4. Quantitative biostratigraphy 1830–1980;Brower,1981
5. A simple method for quantitative biostratigraphy;Brower,1982