Kegley, Charles William, Jr.
St. Martin`s Press, 1997
Buku Teks SO
Lerche, Charles O., Jr.
Oxford University Press, 1956
Buku Teks SO
Andrew Hurrell, Ngaire Woods, Satria Utama S., Diana Arimbi
Fakultas Ekonomi UI, 2001
Buku Teks SO
Kalijarvi, Thorsten V.
Thomas Y. Crowell, 1954
Buku Teks SO
Padelford, Norman J.
Macmillan, 1962
Buku Teks SO