Heghin, M., & Thomas, F. O. (1937). Manual for Steps to citizenship. Works Progress Administration, Adult Education Project, University of Chicago.
Lua i Stíl Chicago (17ú heag.)Heghin, Mary, agus Frances O. Thomas. Manual for Steps to Citizenship. Chicago: Works Progress Administration, Adult Education Project, University of Chicago, 1937.
Lua MLA (8ú heag.)Heghin, Mary, agus Frances O. Thomas. Manual for Steps to Citizenship. Works Progress Administration, Adult Education Project, University of Chicago, 1937.
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