Forbush, D. R. (1987). Study guide and problems to accompany economics (8ª ed.). Harper and Row.
Cita Chicago Style (17a ed.)Forbush, Dascomb R. Study Guide and Problems to Accompany Economics. 8ª ed. Harper and Row, 1987.
Cita MLA (9a ed.)Forbush, Dascomb R. Study Guide and Problems to Accompany Economics. 8ª ed. Harper and Row, 1987.
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