Cooper, K. (1942). Barriers down. Farrar and Rinehart.
Lua i Stíl Chicago (17ú heag.)Cooper, Kent. Barriers Down. New York: Farrar and Rinehart, 1942.
Lua MLA (9ú heag.)Cooper, Kent. Barriers Down. Farrar and Rinehart, 1942.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.