Landis, J. R. (1992). Sociology: Concepts and characteristics. Wadsworth Pub. Co..
Lua i Stíl Chicago (17ú heag.)Landis, Judson R. Sociology: Concepts and Characteristics. Belmont, Calif.: Wadsworth Pub. Co., 1992.
Lua MLA (9ú heag.)Landis, Judson R. Sociology: Concepts and Characteristics. Wadsworth Pub. Co., 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.