Sugden, D. R. (2009). Gray markets: Prevention, detection, and litigation. Oxford University Press.
استشهاد بنمط شيكاغوSugden, David R. Gray Markets: Prevention, Detection, and Litigation. Oxford: Oxford University Press, 2009.
MLA استشهادSugden, David R. Gray Markets: Prevention, Detection, and Litigation. Oxford University Press, 2009.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.