Charles Lyell (1863). “The Geological Evidences of the Antiquity of Man with Remarks on Theories of the Origin of Species by Variation by Charles Lyell”, p.506
Sir Charles Lyell (1845). “Travels in North America, in the Years 1841-2: With Geological Observations on the United States, Canada, and Nova Scotia”, p.15
Sir Charles Lyell (1853). “Principles of geology ; or, The modern changes of the earth and its inhabitants considered as illustrative of geology”, p.696