Collins, J. D. (1972). The Catholic Worker Movement in the nineteen thirties.
Lua i Stíl Chicago (17ú heag.)Collins, Joseph Daniel. The Catholic Worker Movement in the Nineteen Thirties. 1972.
Lua MLA (8ú heag.)Collins, Joseph Daniel. The Catholic Worker Movement in the Nineteen Thirties. 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.