East, W. Gordon
Our fragmented world : an introduction to political geography / W. Gordon East, J.R.V. Prescott
Macmillan, 1975
 Buku Teks SO
Jackson, W.A. Douglas
Politics and geographic relationships: readings on the nature of political geography / W. A. Douglas Jackson
Prenciton-Hall , 1964
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Buss, Leo W.
The evolution of individuality / Leo W. Buss
Princeton University Press, 1987
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Ivey, Paul W.
Successful salesmanship / by Paul W. Ivey, Walter Horvath
Prentice-Hall, 1961
 Buku Teks SO
Likins, Peter W.
Elements of engineering mechanics / Peter W. Likins
McGraw-Hill Kogakusha, 1973
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