Adkins, Lesley
Cambridge University Press, 1989
Buku Teks
Clark, Grahame
Barnes & Noble, 1957
Buku Teks
Silverberg, Robert, author
Chilton Book, 1966
Buku Teks
edited by C. W. Ceram
Alfred A. Knopf, 1966
Buku Teks
Hodder, Ian, author
International Thomson, 1995
Buku Teks