APA aipamena

Long, D. (2003). Gas Trading Manual (Second Edition). ELSEVIER.

Chicago Style aipamena

Long, David. Gas Trading Manual (Second Edition). ELSEVIER, 2003.

MLA aipamena

Long, David. Gas Trading Manual (Second Edition). ELSEVIER, 2003.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.