Não informado. (1961). Society of Petroleum Engineers Journal. Society of Petroleum Engineers.
Lua i Stíl Chicago (17ú heag.)Não informado. Society of Petroleum Engineers Journal. Dallas, Tex: Society of Petroleum Engineers, 1961.
Lua MLA (8ú heag.)Não informado. Society of Petroleum Engineers Journal. Society of Petroleum Engineers, 1961.
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