Forrest-Thomson, Veronica, author
Manchester University Press, 1978
Buku Teks
Russell, John David, author
Johns Hopkins University Press, 1979
Buku Teks
Cambridge University Press, 2003
eBooks
Williams, Harold Herbert, author
Sidgwick & Jackson, 1918
Buku Teks
edited by Hersh Zeifman and Cynthia Zimmerman
Macmillan, 1993
Buku Teks