Wang, James C.F.
Prentice-Hall, 1994
Buku Teks SO
editors, Roy C. Macridis and Robert E. Ward
Prentice-Hall, 1963
Buku Teks SO
edited by Lucian W. Pye
Little, Brown, 1970
Buku Teks SO
Butwell, Richard
Praeger, 1961
Buku Teks SO
Butwell, Richard
Frederick A. Praeger, 1962
Buku Teks SO