APA aipamena

(1999). Vol. 97, № 50; OiL and Gas journal. 1999.

Chicago Style aipamena

Vol. 97, № 50; OiL and Gas Journal. 1999, 1999.

MLA aipamena

Vol. 97, № 50; OiL and Gas Journal. 1999, 1999.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.