Dyfyniad APA

Kurtzig, M. E. (1974). Agricultural production and trade. U.S. Dept. of Agriculture, Economic Research Service.

Dyfyniad Arddull Chicago

Kurtzig, Michael E. Agricultural Production and Trade. [Washington]: U.S. Dept. of Agriculture, Economic Research Service, 1974.

Dyfyniad MLA

Kurtzig, Michael E. Agricultural Production and Trade. U.S. Dept. of Agriculture, Economic Research Service, 1974.

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