Gardner, H. S. (1998). Comparative economic systems (2nd ed.). Harcourt.
Lua i Stíl Chicago (17ú heag.)Gardner, H. Stephen. Comparative Economic Systems. 2nd ed. Orlando: Harcourt, 1998.
Lua MLA (9ú heag.)Gardner, H. Stephen. Comparative Economic Systems. 2nd ed. Harcourt, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.