Strachey, Lytton, author
London William Collins and Sons 1959
Buku Teks
Hudson, William Henry, author
London George G. Harrap 1913
Buku Referensi
Liberal Arts Press, 1949
Buku Teks
Landmann, Michael
Bouvier Verlag Herbert Grundmann, 1977
Buku Teks
Oxford: Oxford University Press
Majalah, Jurnal, Buletin