Hardert, R. A. (1974). Sociology and social issues. Rinehart Press.
Lua i Stíl Chicago (17ú heag.)Hardert, Ronald A. Sociology and Social Issues. San Francisco: Rinehart Press, 1974.
Lua MLA (9ú heag.)Hardert, Ronald A. Sociology and Social Issues. Rinehart Press, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.