Fehrle, Eugen
Buku Teks
Marchant, James Robert Vernam, 1853-1936, editor
New York Funk & Wagnalls [t.th.]
Buku Teks
Janos, author
Budapest Franklin 1902
Buku Referensi
Lewis, Charlton T., author
New York American Book 1918
Buku Referensi
Penz, Charles, author
Librairie Larousse, 1956
Buku Teks