Oster,Sharon M. (1999). Modern competitive analysis (3rd ed.). Oxford University Press.
Chicago Style aipamenaOster,Sharon M. Modern Competitive Analysis. 3rd ed. New York: Oxford University Press, 1999.
MLA aipamenaOster,Sharon M. Modern Competitive Analysis. 3rd ed. Oxford University Press, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.