Soemitro Djojohadikusumo
[publisher not identified], 1975
Buku Teks
Chicago : encyclopaedia Britanica Inc, 2000,
Buku Referensi
Junaidi
Faculty of Humanities University of Indonesia, 2002
Artikel Jurnal
Mudie, Robyn
The University of Hull , 1998
Buku Teks
Rollason, Russell G.
Alternative Pub. Cooperative, 1981
Buku Teks