Ulmer, Melville J.
Economics theory and practice
Houghton Miffiln, 1959
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Colander, David C.
Economics / David C. Colander
McGraw-Hill, 2004
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Carson, Richard L.
Comparative econnomic systems
Macmillan, 1973
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Frain, H. LaRue
An introduction to economics / by H. LaRue Frain
Hougton Mifflin Company, 1937
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Blaug, Mark
Economic theory in retrospect
Cambridge University Press, 1987
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