Não informado. (1961). Society of Petroleum Engineers Journal. Society of Petroleum Engineers.
Citace podle Chicago (17th ed.)Não informado. Society of Petroleum Engineers Journal. Dallas, Tex: Society of Petroleum Engineers, 1961.
Citace podle MLA (8th ed.)Não informado. Society of Petroleum Engineers Journal. Society of Petroleum Engineers, 1961.
Upozornění: Tyto citace jsou generovány automaticky. Nemusí být zcela správně podle citačních pravidel..