Wonnacott, P., & Wonnacott, R. J. (1990). Economics (4th.ed.). John Wiley & sons.
Lua i Stíl Chicago (17ú heag.)Wonnacott, Paul, agus Ronald J. Wonnacott. Economics. 4th.ed. New York: John Wiley & sons, 1990.
Lua MLA (9ú heag.)Wonnacott, Paul, agus Ronald J. Wonnacott. Economics. 4th.ed. John Wiley & sons, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.