Rossiter, Clinton, 1917-1970
The American Library, 1960
Buku Teks SO
Mervin, David
Longman, 1990
Buku Teks SO
Corwin, Edward S.
New York University Press, 1956
Buku Teks
Schubert, Glendon A., Jr
University of Minnesota Press, 1956
Buku Teks
Makarim Wibisono [and others]
The Permanent Mission of the Repubilc of Indonesia to the Uniterd Nations, 2001
Buku Teks