Não informado. (1979). AAPG explorer. American Association of Petroleum Geologists.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. AAPG Explorer. Tulsa, Okla: American Association of Petroleum Geologists, 1979.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. AAPG Explorer. American Association of Petroleum Geologists, 1979.
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