Papworth, J., & Egan, E. (1987). The human factor in the global crisis.
Lua i Stíl Chicago (17ú heag.)Papworth, John, agus Eileen Egan. The Human Factor in the Global Crisis. 1987.
Lua MLA (8ú heag.)Papworth, John, agus Eileen Egan. The Human Factor in the Global Crisis. 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.