Heghin, M., & Thomas, F. O. (1938). Steps to citizenship: Preparing for naturalization and citizenship (Rev. and enl.). Works Progress Administration, Adult Education Project, University of Chicago.
Lua i Stíl Chicago (17ú heag.)Heghin, Mary, agus Francis O. Thomas. Steps to Citizenship: Preparing for Naturalization and Citizenship. Rev. and enl. Chicago, IL: Works Progress Administration, Adult Education Project, University of Chicago, 1938.
Lua MLA (8ú heag.)Heghin, Mary, agus Francis O. Thomas. Steps to Citizenship: Preparing for Naturalization and Citizenship. Rev. and enl. Works Progress Administration, Adult Education Project, University of Chicago, 1938.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.