Dyfyniad APA

American Petroleum Institute. Division of Marketing. (1963). Sources of petroleum marketing statistics. s.n.

Dyfyniad Arddull Chicago

American Petroleum Institute. Division of Marketing. Sources of Petroleum Marketing Statistics. New York: s.n, 1963.

Dyfyniad MLA

American Petroleum Institute. Division of Marketing. Sources of Petroleum Marketing Statistics. s.n, 1963.

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