APA (7th ed.) Zitazioa
Caspian Oil & Gas Trends. Trend Publishing Incorporated.
Chicago Style (17th ed.) Zitazioa
Caspian Oil & Gas Trends. Trend Publishing Incorporated.
MLA (9th ed.) Zitazioa
Caspian Oil & Gas Trends. Trend Publishing Incorporated.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.