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