Não informado. (1971). Petroleum Refining and Petrochemicals Literature Abstracts. American Petroleum Institute.
Chicago-Zitierstil (17. Ausg.)Não informado. Petroleum Refining and Petrochemicals Literature Abstracts. New York: American Petroleum Institute, 1971.
MLA-Zitierstil (8. Ausg.)Não informado. Petroleum Refining and Petrochemicals Literature Abstracts. American Petroleum Institute, 1971.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.