Cook, Arthur N., author
Littlefield Adams, 1969
Buku Teks
Fowler, Peter J., author
Routledge, 1995
Buku Teks
Sutton, Mark Q., author
Routledge, 2016
Buku Teks
Elvin, Mark, author
Eyre Methuen, 1973
Buku Teks
Muller, Herbert J.
Oxford University Press , 1953
Buku Teks