Helmer, J., & Eddington, N. A. (1973). Urbanman: The psychology of urban survival. Free Press.
Lua i Stíl Chicago (17ú heag.)Helmer, John, agus Neil A. Eddington. Urbanman: The Psychology of Urban Survival. New York: Free Press, 1973.
Lua MLA (9ú heag.)Helmer, John, agus Neil A. Eddington. Urbanman: The Psychology of Urban Survival. Free Press, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.