Lua APA (7ú heag.)
Gregory, P. R. (1990). Essentials of economics (2nd ed.). Scott, Foresman.
Lua i Stíl Chicago (17ú heag.)
Gregory, Paul R. Essentials of Economics. 2nd ed. Glenview, Ill.: Scott, Foresman, 1990.
Lua MLA (9ú heag.)
Gregory, Paul R. Essentials of Economics. 2nd ed. Scott, Foresman, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.