Erosion at Niagara Falls. Samizdat (samizdat.qc.ca). [2011-08-21]. (原始内容存档于2011-09-27). Excerpt from Ian T. Taylor, In the Minds of men: Darwin and the new World Order, 1987; TFE Publishing, 1999 (ISBN9780969178897), pp. 81–84.}}
Erosion at Niagara Falls. Samizdat (samizdat.qc.ca). [2011-08-21]. (原始内容存档于2011-09-27). Excerpt from Ian T. Taylor, In the Minds of men: Darwin and the new World Order, 1987; TFE Publishing, 1999 (ISBN9780969178897), pp. 81–84.}}