Irving, R. H., & Draper, V. R. (1958). Accounting practices in the petroleum industry. Ronald Press.
Lua i Stíl Chicago (17ú heag.)Irving, Robert H., agus Verden R. Draper. Accounting Practices in the Petroleum Industry. New York: Ronald Press, 1958.
Lua MLA (8ú heag.)Irving, Robert H., agus Verden R. Draper. Accounting Practices in the Petroleum Industry. Ronald Press, 1958.
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