Não informado. (1961). Petroleum Abstracts. University of Tulsa, Information Services Division.
Chicago-Zitierstil (17. Ausg.)Não informado. Petroleum Abstracts. Tulsa, Okla: University of Tulsa, Information Services Division, 1961.
MLA-Zitierstil (8. Ausg.)Não informado. Petroleum Abstracts. University of Tulsa, Information Services Division, 1961.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.