Ries, A., & Trout, J. (1986). Marketing warfare. New American Library.
Chicago Style aipamenaRies, Al, and Jack Trout. Marketing Warfare. New York: New American Library, 1986.
MLA aipamenaRies, Al, and Jack Trout. Marketing Warfare. New American Library, 1986.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.