Cita APA (7th ed.)
Helmstetter, G. (1997). Increasing hits and selling more on your Web site. Wiley Computer Pub..
Cita Chicago (17th ed.)
Helmstetter, Greg. Increasing Hits and Selling More on Your Web Site. New York: Wiley Computer Pub., 1997.
Cita MLA (9th ed.)
Helmstetter, Greg. Increasing Hits and Selling More on Your Web Site. Wiley Computer Pub., 1997.
Atenció: Aquestes cites poden no estar 100% correctes.