Fried, H. O., Knox Lovell, C., & Schmidt, S. S. (1993). The measurement of productive efficiency, techniques and applications. Oxford University Press.
Dyfyniad Arddull ChicagoFried, Harold O., C.A Knox Lovell, and Shelton S. Schmidt. The Measurement of Productive Efficiency, Techniques and Applications. New York: Oxford University Press, 1993.
Dyfyniad MLAFried, Harold O., et al. The Measurement of Productive Efficiency, Techniques and Applications. Oxford University Press, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.