Leftwich, R. H. (1982). Economics of social issues (5ª ed.). Business.
Cita Chicago (17th ed.)Leftwich, Richard H. Economics of Social Issues. 5ª ed. Business, 1982.
Cita MLA (9th ed.)Leftwich, Richard H. Economics of Social Issues. 5ª ed. Business, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.