Westview Press , 1991
Buku Teks
Jusuf Wanandi
Centre for Strategic and International Studies, 1996
Buku Teks SO
Jusuf Wanandi
Centre for Strategic and International Studies, 1996
Buku Teks SO
Clune, Lori
Oxford University Press, 2016
eBooks
Smith, Joseph
Blackwell, 1998
Buku Teks SO