Kunkel, Wolfgang
At The Clarendon Press, 1975
Buku Teks
Dickey, Albert Venn, 1835-1922, author
Macmillan, 1985
Buku Teks
Sjotter, David, author
Routledge, 1998
Buku Teks
Richmond, I.A., author
Penguin Books, 1955
Buku Teks
Cary, Otis
Charles E. Tuttle, 1976
Buku Teks