Lipsey, R. G., Steiner, P. O., & Purvis, D. D. (1987). Economics (8th ed.). Harper & Row.
Lua i Stíl Chicago (17ú heag.)Lipsey, Richard G., Peter Otto Steiner, agus Douglas D. Purvis. Economics. 8th ed. New York: Harper & Row, 1987.
Lua MLA (9ú heag.)Lipsey, Richard G., et al. Economics. 8th ed. Harper & Row, 1987.
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