Biddle, B. J., & Thomas, E. J. (1966). Role theory: Concepts and research. Wiley.
Lua i Stíl Chicago (17ú heag.)Biddle, Bruce Jesse, agus Edwin John Thomas. Role Theory: Concepts and Research. New York: Wiley, 1966.
Lua MLA (9ú heag.)Biddle, Bruce Jesse, agus Edwin John Thomas. Role Theory: Concepts and Research. Wiley, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.