Shepard, J. M. (1999). Sociology (7th ed.). Wadsworth.
Lua i Stíl Chicago (17ú heag.)Shepard, Jon M. Sociology. 7th ed. Belmont, Calif: Wadsworth, 1999.
Lua MLA (9ú heag.)Shepard, Jon M. Sociology. 7th ed. Wadsworth, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.