Pollak, R. A., & Wales, T. J. (1992). Demand system specification and estimation. Oxford University Press.
Cita Chicago (17th ed.)Pollak, Robert A., i Terence J. Wales. Demand System Specification and Estimation. New York: Oxford University Press, 1992.
Cita MLA (9th ed.)Pollak, Robert A., i Terence J. Wales. Demand System Specification and Estimation. Oxford University Press, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.