Lua APA (7ú heag.)
de Blij, H. J., & Birdsall, S. S. (1978). Geography: Regions and concepts (2nd ed.). John Wiley.
Lua i Stíl Chicago (17ú heag.)
de Blij, Harm J., agus Stephen S. Birdsall. Geography: Regions and Concepts. 2nd ed. New York: John Wiley, 1978.
Lua MLA (9ú heag.)
de Blij, Harm J., agus Stephen S. Birdsall. Geography: Regions and Concepts. 2nd ed. John Wiley, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.