American Geographical Society's Focus on Geography. Wiley-Blackwell.
Lua i Stíl Chicago (17ú heag.)American Geographical Society's Focus on Geography. Wiley-Blackwell.
Lua MLA (9ú heag.)American Geographical Society's Focus on Geography. Wiley-Blackwell.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.