Sharp, A. M., Register, C. A., & Leftwich, R. H. (1988). Economics of social issues (8th ed.). BPI/Irwin.
Lua i Stíl Chicago (17ú heag.)Sharp, Ansel Miree, Charles A. Register, agus Richard H. Leftwich. Economics of Social Issues. 8th ed. Homewood, IL: BPI/Irwin, 1988.
Lua MLA (9ú heag.)Sharp, Ansel Miree, et al. Economics of Social Issues. 8th ed. BPI/Irwin, 1988.
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