APA (7th ed.) Zitazioa
Helmstetter, G. (1997). Increasing hits and selling more on your Web site. Wiley Computer Pub..
Chicago Style (17th ed.) Zitazioa
Helmstetter, Greg. Increasing Hits and Selling More on Your Web Site. New York: Wiley Computer Pub., 1997.
MLA (9th ed.) Zitazioa
Helmstetter, Greg. Increasing Hits and Selling More on Your Web Site. Wiley Computer Pub., 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.