Não informado. (1961). Petroleum Abstracts. University of Tulsa, Information Services Division.
Style de citation Chicago (17e éd.)Não informado. Petroleum Abstracts. Tulsa, Okla: University of Tulsa, Information Services Division, 1961.
Style de citation MLA (8e éd.)Não informado. Petroleum Abstracts. University of Tulsa, Information Services Division, 1961.
Attention : ces citations peuvent ne pas être correctes à 100%.