Schuman, Frederick L., author
McGraw-Hill, 1969
Buku Teks
Curtin, Patricia A. (Patricia Ann), 1955-, author
Sage Publications, 2007
Buku Teks
Nau, Henry R., 1941-, author
SAGE Publications, 2019
Buku Teks
Claude, Inis L., author
Random House , 1976
Buku Teks
Claude, Inis L., author
Random House, 1964
Buku Teks