Dyfyniad APA

HALM,George. (1951). Economic Systems - George N.Halm. Rinehart&Company,Inc.

Dyfyniad Arddull Chicago

HALM,George. Economic Systems - George N.Halm. Rinehart&Company,Inc, 1951.

Dyfyniad MLA

HALM,George. Economic Systems - George N.Halm. Rinehart&Company,Inc, 1951.

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