Biography.com: Stephen, Leslie - http://search.biography.com/print_record.pl?id=11180 Concise paragraph on this British scholar's life.
Wikipedia: Leslie Stephen - http://www.wikipedia.org/wiki/Leslie_Stephen Entry from this open-access reference work.
Victorian Age Philosophers: Leslie Stephen - http://www.bartleby.com/224/0124.html Brief section from a larger work, emphasizing his ethical interpretation of evolutionary theory.
History of Ideas: Leslie Stephen - http://www.thoemmes.com/404.asp?404;http://www.thoemmes.com/encyclopedia/stephen.htm Detailed biographical study by John Bicknell, from the Thoemmes Dictionary of Nineteenth-Century British Philosophers.