Lua APA (7ú heag.)

Hempel, E. H. (1939). The economics of chemical industries. Wiley.

Lua i Stíl Chicago (17ú heag.)

Hempel, Edward Henry. The Economics of Chemical Industries. New York: Wiley, 1939.

Lua MLA (9ú heag.)

Hempel, Edward Henry. The Economics of Chemical Industries. Wiley, 1939.

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