Bish, R. L., & Kirk, R. J. (1974). Economic principles and urban problems. Prentice - hall.
Lua i Stíl Chicago (17ú heag.)Bish, Robert L., agus Robert J. Kirk. Economic Principles and Urban Problems. New Jersey: Prentice - hall, 1974.
Lua MLA (9ú heag.)Bish, Robert L., agus Robert J. Kirk. Economic Principles and Urban Problems. Prentice - hall, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.