Lewis, P. H. (1998). The enemy within. Today.
Lua i Stíl Chicago (17ú heag.)Lewis, Peter H. "The Enemy Within." Today 1998.
Lua MLA (9ú heag.)Lewis, Peter H. "The Enemy Within." Today, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.