Thomas Robert Malthus: An Essay on the Principle of Population, as it Affects the Future Improvement of Society with Remarks on the Speculations of Mr. Godwin, M. Condorcet, and Other Writers. London 1798; PDF Online
web.archive.org
On the Law Which Has Regulated the Introduction of New Species. In: Annals and Magazine of Natural History. 2. Serie, Band 16, S. 184–196, London 1855; onlineArchivado el 28 de abril de 2007 en Wayback Machine.
On the Tendency of Varieties to Depart Indefinitely From the Original Type. In: Journal of the Proceedings of the Linnean Society: Zoology. Band 3, Nr. 9, S. 53–62, London 1858; onlineArchivado el 29 de abril de 2007 en Wayback Machine.
wku.edu
wku.edu
On the Law Which Has Regulated the Introduction of New Species. In: Annals and Magazine of Natural History. 2. Serie, Band 16, S. 184–196, London 1855; onlineArchivado el 28 de abril de 2007 en Wayback Machine.
On the Natural History of the Aru Islands. In: The Annals and Magazine of Natural History. 2. Serie, Supplement zu Band 20, S. 473–485, London 1857; online
On the Tendency of Varieties to Depart Indefinitely From the Original Type. In: Journal of the Proceedings of the Linnean Society: Zoology. Band 3, Nr. 9, S. 53–62, London 1858; onlineArchivado el 29 de abril de 2007 en Wayback Machine.