Persell, C. H. (1984). Understanding society. Harper & Row Publishers.
Lua i Stíl Chicago (17ú heag.)Persell, Caroline Hodges. Understanding Society. New York: Harper & Row Publishers, 1984.
Lua MLA (9ú heag.)Persell, Caroline Hodges. Understanding Society. Harper & Row Publishers, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.