Ratcliff, R. U. (1972). Urban land economics. Greenwood Press.
Lua i Stíl Chicago (17ú heag.)Ratcliff, Richard Updegraff. Urban Land Economics. Westport, Conn.: Greenwood Press, 1972.
Lua MLA (9ú heag.)Ratcliff, Richard Updegraff. Urban Land Economics. Greenwood Press, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.