Lua APA (7ú heag.)

US Department of Agriculture. (1956). Agricultural marketing. U.S. Department of Agriculture, Agricultural Marketing Service.

Lua i Stíl Chicago (17ú heag.)

US Department of Agriculture. Agricultural Marketing. Washington: U.S. Department of Agriculture, Agricultural Marketing Service, 1956.

Lua MLA (8ú heag.)

US Department of Agriculture. Agricultural Marketing. U.S. Department of Agriculture, Agricultural Marketing Service, 1956.

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