Hopkins, A. L. (1943). Periscope peeks at the world above. Our Sunday Visitor.
Lua i Stíl Chicago (17ú heag.)Hopkins, A. L. Periscope Peeks at the World Above. Huntington, Ind.: Our Sunday Visitor, 1943.
Lua MLA (8ú heag.)Hopkins, A. L. Periscope Peeks at the World Above. Our Sunday Visitor, 1943.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.