(1988). Geography Regions And Concepts/ Harm J. De Blij And Peter O. Muller. John Willey & Sons.
Lua i Stíl Chicago (17ú heag.)Geography Regions And Concepts/ Harm J. De Blij And Peter O. Muller. John Willey & Sons, 1988.
Lua MLA (8ú heag.)Geography Regions And Concepts/ Harm J. De Blij And Peter O. Muller. John Willey & Sons, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.