ebrary, Inc, & Kelleher, N. B. (2012). U.S. oil sources: Turmoil and tranquility. Nova Science Publishers.
Čikaški stil citiranja (17. izdanje)ebrary, Inc, i Natalie B. Kelleher. U.S. Oil Sources: Turmoil and Tranquility. Hauppauge, N.Y.: Nova Science Publishers, 2012.
MLA način citiranja (9. izdanje)ebrary, Inc, i Natalie B. Kelleher. U.S. Oil Sources: Turmoil and Tranquility. Nova Science Publishers, 2012.
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