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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Heghin, Mary, و 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.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Heghin, Mary, و Francis O. Thomas. Steps to Citizenship: Preparing for Naturalization and Citizenship. Rev. and enl. Works Progress Administration, Adult Education Project, University of Chicago, 1938.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.