LaPalombara, Joseph
Conference Board, 1977
Buku Teks SO
Cullen, John Brooks, 1948-
Thomson, 2005
Buku Teks SO
Martyn, Howe
Lexington Books, 1972
Buku Teks
Keegan, Warren J.
Prentice Hall of India, 1982
Buku Teks SO
Abdullah, Fuad A.
Prentice-Hall International, 1987
Buku Teks