Não informado. (1979). AAPG explorer. American Association of Petroleum Geologists.
Lua i Stíl Chicago (17ú heag.)Não informado. AAPG Explorer. Tulsa, Okla: American Association of Petroleum Geologists, 1979.
Lua MLA (8ú heag.)Não informado. AAPG Explorer. American Association of Petroleum Geologists, 1979.
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