Kaynak

262. Duane T. Gish, Evolution: The Fossils Still Say No, ICR, San Diego, 1998, s. 103.
263. Robert L. Carroll, Vertebrate Paleontology and Evolution, s. 336
264. "Evolution's Erratic Pace", Stephen Gould, Mayıs 1977, Natural History, cilt 86, ss. 12-16.
265. "Evolution's Erratic Pace", Stephen Gould, Mayıs 1977, Natural History, cilt 86, ss. 12-16.
266. Stephen M. Stanley, Macroevolution: Pattern and Process, W. H. Freeman and Co., San Francisco, 1979, ss. 35, 159.
267. S. J. Gould, "Return of the Hopeful Monster", The Panda's Thumb, W. W. Norton Co., New York, 1980, ss. 186-193.