Ries, A. (2002). Fall of advertising and the rise of PR (NA.). Harper Collins.
Chicago Style aipamenaRies, Al. Fall of Advertising and the Rise of PR. NA. New York: Harper Collins, 2002.
MLA aipamenaRies, Al. Fall of Advertising and the Rise of PR. NA. Harper Collins, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.