Heghin, M., & Thomas, F. O. (1937). Manual for Steps to citizenship. Works Progress Administration, Adult Education Project, University of Chicago.
Chicago-referens (17:e uppl.)Heghin, Mary, och Frances O. Thomas. Manual for Steps to Citizenship. Chicago: Works Progress Administration, Adult Education Project, University of Chicago, 1937.
MLA-referens (8:e uppl.)Heghin, Mary, och Frances O. Thomas. Manual for Steps to Citizenship. Works Progress Administration, Adult Education Project, University of Chicago, 1937.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.