Parkin, M., Powell, M., & Matthews, K. (2017). Economics (Tenth Edition.). Pearson.
Lua i Stíl Chicago (17ú heag.)Parkin, Michael, Melanie Powell, agus Kent Matthews. Economics. Tenth Edition. New York: Pearson, 2017.
Lua MLA (8ú heag.)Parkin, Michael, et al. Economics. Tenth Edition. Pearson, 2017.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.