Simpson, J., & Collins, A. (2008). Touching the void (abridged version). Macmillan.
Lua i Stíl Chicago (17ú heag.)Simpson, Joe, agus Anne Collins. Touching the Void (abridged Version). Oxford: Macmillan, 2008.
Lua MLA (9ú heag.)Simpson, Joe, agus Anne Collins. Touching the Void (abridged Version). Macmillan, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.