Epstein, A. (1938). Insecurity, a challenge to America: A study of social insurance in the United States and abroad (2d rev. ed.). Random House.
Lua i Stíl Chicago (17ú heag.)Epstein, Abraham. Insecurity, a Challenge to America: A Study of Social Insurance in the United States and Abroad. 2d rev. ed. New York: Random House, 1938.
Lua MLA (8ú heag.)Epstein, Abraham. Insecurity, a Challenge to America: A Study of Social Insurance in the United States and Abroad. 2d rev. ed. Random House, 1938.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.