Παραπομπή APA

Sugden, D. R. (2009). Gray markets: Prevention, detection, and litigation. Oxford University Press.

Παραπομπή Chicago Style

Sugden, David R. Gray Markets: Prevention, Detection, and Litigation. Oxford: Oxford University Press, 2009.

Παραπομπή MLA

Sugden, David R. Gray Markets: Prevention, Detection, and Litigation. Oxford University Press, 2009.