Greenaway, D. (1991). Global protectionism. Macmillan.
Lua i Stíl Chicago (17ú heag.)Greenaway, David. Global Protectionism. London: Macmillan, 1991.
Lua MLA (9ú heag.)Greenaway, David. Global Protectionism. Macmillan, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.