Lipsey, R. G., Sparks, G. R., & Steiner, P. O. (1976). Economics (2nd. ed.). Harper & Row.
Cita Chicago Style (17a ed.)Lipsey, Richard G., Gordon R. Sparks, y Peter O. Steiner. Economics. 2nd. ed. New York: Harper & Row, 1976.
Cita MLA (8a ed.)Lipsey, Richard G., et al. Economics. 2nd. ed. Harper & Row, 1976.
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