Bloomsbury Publishing, 2014
Buku Teks
Charles W. Eliot, edited
P. F. Collier & Son Corporation, 1959
Buku Referensi
edited by R. Meurig Evans
Macmillan, 1975
Buku Teks
editor, Salvatore Attardo
Sage, 2014
Buku Referensi
Clarke, William Eagle, 1853-1938, author
Cambridge University Press, 2014
Buku Teks