Clark, J. R. (1982). Study Guide for Essentials of Economics. ELSEVIER.
Lua i Stíl Chicago (17ú heag.)Clark, J. R. Study Guide for Essentials of Economics. ELSEVIER, 1982.
Lua MLA (8ú heag.)Clark, J. R. Study Guide for Essentials of Economics. ELSEVIER, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.