Sugden, D. R. (2009). Gray markets: Prevention, detection, and litigation. Oxford University Press.
Dyfyniad Arddull ChicagoSugden, David R. Gray Markets: Prevention, Detection, and Litigation. Oxford: Oxford University Press, 2009.
Dyfyniad MLASugden, David R. Gray Markets: Prevention, Detection, and Litigation. Oxford University Press, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.