Keiser, Norman F.
Introductory economics
John Wiley & Sons, 1960
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Stanlake, G.F.
Introductory economics
Longman, 1987
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Bradley, Iver E.
Introductory statistics for business and economics
Dryden Press, 1981
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Samuelson, Paul Anthony, 1915-2009
Economics an introductory analysis
McGraw-Hill, 1985
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Samuelson, Paul Anthony, 1915-2009
Economics an introductory analysis
McGraw-Hill, 1958
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