Kalt, N. C., & Zalkind, S. S. (1976). Urban problems: Psychological inquiries, readings and text. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Kalt, Neil C., agus Sheldon S. Zalkind. Urban Problems: Psychological Inquiries, Readings and Text. New York: Oxford University Press, 1976.
Lua MLA (9ú heag.)Kalt, Neil C., agus Sheldon S. Zalkind. Urban Problems: Psychological Inquiries, Readings and Text. Oxford University Press, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.