World.. & OGDEN, S. P. (1989). World politics 90/91. --ed.7. The Dushkin.
Lua i Stíl Chicago (17ú heag.)World.. agus Suzanne P. OGDEN. World Politics 90/91. --ed.7. Guilford: The Dushkin, 1989.
Lua MLA (9ú heag.)World.. agus Suzanne P. OGDEN. World Politics 90/91. --ed.7. The Dushkin, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.