Leftwich, R. H. (1982). Economics of social issues (5ª ed.). Business.
Chicago-čujuhus (17. p.)Leftwich, Richard H. Economics of Social Issues. 5ª ed. Business, 1982.
MLA-čujuhus (9. p.)Leftwich, Richard H. Economics of Social Issues. 5ª ed. Business, 1982.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.