International Encyclopedia of goverment and politics
"S.Chand ,
Buku Teks
Encyclopedia of international media and communications
editor-in-chief, Donald H. Johnsto
Academic press, 2003
Buku Referensi
International encyclopedia of political science
SAGE Reference, 2011
Buku Referensi
International petroleum encyclopedia 1996
editor Jim West
PennWell Pub. Co., 1998
Buku Referensi
International Petroleum encyclopedia 1990
editor, John C. McCaslin
PennWell Publishing , 1990
Buku Referensi
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