Lua APA (7ú heag.)
Hirsh, S. A., & Wiggins, K. T. (1989). World geography today. Holt, Rinehart and Winston.
Lua i Stíl Chicago (17ú heag.)
Hirsh, Stephanie A., agus Karen Tindel Wiggins. World Geography Today. Austin, Tex.: Holt, Rinehart and Winston, 1989.
Lua MLA (9ú heag.)
Hirsh, Stephanie A., agus Karen Tindel Wiggins. World Geography Today. Holt, Rinehart and Winston, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.