APA aipamena

Zemke, R. (2001). E-service. McGraw-Hill.

Chicago Style aipamena

Zemke, Ron. E-service. McGraw-Hill, 2001.

MLA aipamena

Zemke, Ron. E-service. McGraw-Hill, 2001.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.