APA (7 वां संस्करण) प्रशस्ति पत्र

Não informado. (1961). Petroleum Abstracts. University of Tulsa, Information Services Division.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Não informado. Petroleum Abstracts. Tulsa, Okla: University of Tulsa, Information Services Division, 1961.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Não informado. Petroleum Abstracts. University of Tulsa, Information Services Division, 1961.

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