Snodgrass, M. . M., & Wallace, L. T. (1977). Agriculture , economics and resources management. Prentice hall.
Dyfyniad Arddull ChicagoSnodgrass, Milton M., and L. T. Wallace. Agriculture , Economics and Resources Management. New Delhi: Prentice hall, 1977.
Dyfyniad MLASnodgrass, Milton M., and L. T. Wallace. Agriculture , Economics and Resources Management. Prentice hall, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.