Knox, Paul
The geography of the world economy : an introduction to economic geography
Edward Arnold , 1994
 Buku Teks SO
Case studies in world geography : occupance and economy types
by Richard M. Highsmith, Jr.... [et.al.]
Prentice-Hall, 1961
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Wheeler, James O.
Economic geography
John Wiley & Sons, 1986
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Alexander, John W.
Economic geography
Prentice-Hall, 1979
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Hartshorn, Truman Asa
Economic geography
Prentice-Hall, 1988
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