Παραπομπή σε μορφή APA (7η εκδ.)

Não informado. (1971). Petroleum Refining and Petrochemicals Literature Abstracts. American Petroleum Institute.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Não informado. Petroleum Refining and Petrochemicals Literature Abstracts. New York: American Petroleum Institute, 1971.

Παραπομπή σε μορφή MLA (8th εκδ.)

Não informado. Petroleum Refining and Petrochemicals Literature Abstracts. American Petroleum Institute, 1971.

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