Roskin, Michael G.
Pearson/Prentice Hall, 2004
Buku Teks SO
Rourke, John T.
McGraw-Hill, 2010
Buku Teks SO
Kegley, Charles William, Jr.
St. Martin`s Press, 1997
Buku Teks SO
Andrew Hurrell, Ngaire Woods, Satria Utama S., Diana Arimbi
Fakultas Ekonomi UI, 2001
Buku Teks SO
Blackburn, Glenn
St. Martin's, 1985
Buku Teks SO