Macridis, Roy C.
Dorsey Press, 1972
Buku Teks
Denny J.A.
Jayabaya University Press , 1999
Buku Teks SO
Brown, Bernard E. (Bernard Edward)
Thomson, 2006
Buku Teks
edited by Roy C. Macridis and Bernard E. Brown
Wadsworth, 1990
Buku Teks
Wilson, Graham K.
Chatham House, 1985
Buku Teks