Sugden, D. R. (2009). Gray markets: Prevention, detection, and litigation. Oxford University Press.
Čikaški stil citiranjaSugden, David R. Gray Markets: Prevention, Detection, and Litigation. Oxford: Oxford University Press, 2009.
MLA način citiranjaSugden, David R. Gray Markets: Prevention, Detection, and Litigation. Oxford University Press, 2009.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.