Dyfyniad APA

Leftwich, R. H., & Sharp, A. M. (1980). Economics of social issues (4th ed.). Business Publications.

Dyfyniad Arddull Chicago

Leftwich, R. H., and A. M. Sharp. Economics of Social Issues. 4th ed. USA: Business Publications, 1980.

Dyfyniad MLA

Leftwich, R. H., and A. M. Sharp. Economics of Social Issues. 4th ed. Business Publications, 1980.

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