Damon, Philip
University of California Press, 1961
Buku Klasik
Ker, W.P.
Dover Publication, Inc., 1957
Buku Teks
Jackson, William Thomas Hobdell
Collier, 1966
Buku Teks
Hobsbaum, Philip
Routledge, 1996
Buku Teks
Holzberg, Niklas, author
Routledge, 1995
Buku Teks