APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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