Vago, S. (1996). Social change (3rd ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Vago, Steven. Social Change. 3rd ed. Upper Saddle River, N.J: Prentice Hall, 1996.
Lua MLA (9ú heag.)Vago, Steven. Social Change. 3rd ed. Prentice Hall, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.