Firth, Charles Harding, author
G.P. Putnams Sons, 1928
Buku Teks
Morgan, Gwenda, author
UCL Press, 1998
Buku Teks
Erikson, Kai T.
New York, N.Y. John Wiley & Sons 1966,
Buku Teks
Elton, G. R. (Geoffrey Rudolph), author
Cambridge University Press, 1972
Buku Teks
Dickens, Charles, 1812-1870, author
Papercutz, 2012
Buku Teks