Thomson, J.A.K.
Penguin, 1955
Buku Teks
Allan, D.J.
Oxford University,, 1957
Buku Teks
Echenique, Javier, author
Cambridge University Press, 2012
Buku Teks
Jowett, Benjamin, author
The Viking Press, 1957
Buku Teks
Medawar, P.B.
Harvard University Press, 1983
Buku Referensi