Lipsey, R. G. (1990). Economics (9th ed.). Harper & Row.
Lua i Stíl Chicago (17ú heag.)Lipsey, Richard G. Economics. 9th ed. New York: Harper & Row, 1990.
Lua MLA (9ú heag.)Lipsey, Richard G. Economics. 9th ed. Harper & Row, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.