Jurnal Kajian Wilayah Eropah, I (2) Mei 2005: 115-139,
Artikel Jurnal
Foreign Language Press, 1959
Buku Teks
Saxena, H.L.
S. Chand & Co, 1957
Buku Teks
Pelin, Elin
Foreign Languages Press, 1965
Buku Teks
Black, C. E.
Princeton University press, 1943
Buku Teks