APA (7th ed.) Zitazioa

ebrary, Inc, & Beltran, A. (2010). A comparative history of national oil companies. P.I.E. Peter Lang.

Chicago Style (17th ed.) Zitazioa

ebrary, Inc, eta Alain Beltran. A Comparative History of National Oil Companies. Bruxelles ; New York: P.I.E. Peter Lang, 2010.

MLA (9th ed.) Zitazioa

ebrary, Inc, eta Alain Beltran. A Comparative History of National Oil Companies. P.I.E. Peter Lang, 2010.