Byrns, R. T., & Stone, G. W. (1989). Economics (4th ed.). Scott, Foresman.
Lua i Stíl Chicago (17ú heag.)Byrns, Ralph T., agus Gerald W. Stone. Economics. 4th ed. Glenview, Ill.: Scott, Foresman, 1989.
Lua MLA (8ú heag.)Byrns, Ralph T., agus Gerald W. Stone. Economics. 4th ed. Scott, Foresman, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.