Bacon, Roy
Sunburst Books, 1995
Buku Teks
Bacon, Wallace A.
Holt, Rinehart and Winston, Inc., 1972
Buku Teks
Frost, Walter
Munchen Verlag Ernst Reinhardt 1926
Buku Teks
Bowen, Cathereve Drinker
Buku Teks
Kumar, Rajesh, 1971-, author
Centre for Strategic and International Studies, 1997
Buku Teks