Pfefferbaum, R. (1987). Economics: Study guide (2nd ed.). Houghton Mifflin.
Chicago-čujuhus (17. p.)Pfefferbaum, Rose. Economics: Study Guide. 2nd ed. Boston: Houghton Mifflin, 1987.
MLA-čujuhus (9. p.)Pfefferbaum, Rose. Economics: Study Guide. 2nd ed. Houghton Mifflin, 1987.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.