Não informado. (1961). Petroleum Abstracts. University of Tulsa, Information Services Division.
Chicago-referens (17:e uppl.)Não informado. Petroleum Abstracts. Tulsa, Okla: University of Tulsa, Information Services Division, 1961.
MLA-referens (8:e uppl.)Não informado. Petroleum Abstracts. University of Tulsa, Information Services Division, 1961.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.