Tangkilisan, Yuda Benharry, author
Universitas Indonesia, 2000
UI - Laporan Penelitian
Beijing Gaodeng Jiayu 1998
Buku Referensi
RIddle, K. Wilkinson, author
London Arco 1962
Buku Referensi
Kohring, Klause H., author
Munchen Mase Hueber 1973
Buku Referensi
Brewer, E. Cobham, author
New York, Harper Brothers
Buku Referensi