APA aipamena

World Book, Inc, & IBM Corp. (1998). 1999 World Book international deluxe English edition. IBM.

Chicago Style aipamena

World Book, Inc, and IBM Corp. 1999 World Book International Deluxe English Edition. Ireland: IBM, 1998.

MLA aipamena

World Book, Inc, and IBM Corp. 1999 World Book International Deluxe English Edition. IBM, 1998.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.