APA aipamena

(1991). The world competitiveness report 1991. Switzerland: IMD Publishing.

Chicago Style aipamena

The World Competitiveness Report 1991. Switzerland: IMD Publishing, 1991.

MLA aipamena

The World Competitiveness Report 1991. Switzerland: IMD Publishing, 1991.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.