Berry, B. J. L. (1970). Geographic perspectives on urban systems: With integrated readings. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Berry, Brian Joe Lobley. Geographic Perspectives on Urban Systems: With Integrated Readings. Englewood Cliffs, NJ: Prentice-Hall, 1970.
Lua MLA (9ú heag.)Berry, Brian Joe Lobley. Geographic Perspectives on Urban Systems: With Integrated Readings. Prentice-Hall, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.