Williams, G. L., & Williams, A. L. (1974). Crisis in European defence: The next ten years. St. Martin's Press.
Lua i Stíl Chicago (17ú heag.)Williams, Geofrey Lee, agus Alan Lee Williams. Crisis in European Defence: The Next Ten Years. New York: St. Martin's Press, 1974.
Lua MLA (9ú heag.)Williams, Geofrey Lee, agus Alan Lee Williams. Crisis in European Defence: The Next Ten Years. St. Martin's Press, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.