Brittanica online. “Lake (physical feature)”. 2008年6月25日閲覧。 “[a Lake is] any relatively large body of slowly moving or standing water that occupies an inland basin of appreciable size. Definitions that precisely distinguish lakes, ponds, swamps, and even rivers and other bodies of nonoceanic water are not well established. It may be said, however, that rivers and streams are relatively fast moving; marshes and swamps contain relatively large quantities of grasses, trees, or shrubs; and ponds are relatively small in comparison to lakes. Geologically defined, lakes are temporary bodies of water.”
calacademy.org
“Definition of Life”. California Academy of Sciences (2006年). 2007年1月7日閲覧。
Diamond J; Ashmole, N. P.; Purves, P. E. (1989). “The present, past and future of human-caused extinctions”. Philos Trans R Soc Lond B Biol Sci325 (1228): 469–76; discussion 476–7. doi:10.1098/rstb.1989.0100. PMID2574887.
Diamond J; Ashmole, N. P.; Purves, P. E. (1989). “The present, past and future of human-caused extinctions”. Philos Trans R Soc Lond B Biol Sci325 (1228): 469–76; discussion 476–7. doi:10.1098/rstb.1989.0100. PMID2574887.
Withers, Mark A.; et al. (1998年). “Changing Patterns in the Number of Species in North American Floras”. Land Use History of North America. September 26, 2006閲覧。 このウェブサイトは次の書籍に基づいている Sisk, T.D., ed., ed (1998). Perspectives on the land use history of North America: a context for understanding our changing environment (Revised September 1999 ed.). U.S. Geological Survey, Biological Resources Division. USGS/BRD/BSR-1998-0003