Rachel Feltman. A new class of galaxy has been discovered, one made almost entirely of dark matter. Washington Post. 25 August 2016 [2016-11-01]. (原始内容存档于2020-12-02)
Handbook of Historical Linguistics(Blackwell, 2004)ISBN 1-4051-2747-3 Roger Lass, Historical linguistics and language change.(Cambridge University Press,