Boyes,William, & Melvin, M. (1991). Economics. Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Boyes,William, agus Michael Melvin. Economics. Boston: Houghton Mifflin, 1991.
Lua MLA (9ú heag.)Boyes,William, agus Michael Melvin. Economics. Houghton Mifflin, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.