Leftwich, Richard H.
Economics of social issues
Business Publications, 1982
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Sharp, Ansel M.
Economics of social issues
Business Publications, 1986
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Sharp, Ansel M.
Economics of social issues
Richard D. Irwin, 1990
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Leftwich, Richard H.
Economics of social issues
Business Publications, 1974
 Buku Teks SO
Sharp, Ansel M.
Economics of social issues
McGraw-Hill, 1998
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