Lua APA (7ú heag.)

Day, W. H. (1966). Petroleum marketing practices and problems. Commercial Pub.

Lua i Stíl Chicago (17ú heag.)

Day, William Henry. Petroleum Marketing Practices and Problems. Tulsa, Okla: Commercial Pub, 1966.

Lua MLA (9ú heag.)

Day, William Henry. Petroleum Marketing Practices and Problems. Commercial Pub, 1966.

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