National Geographic society. (1992). Beyond the horizon: Adventures in faraway lands. National Geographic Society.
Lua i Stíl Chicago (17ú heag.)National Geographic society. Beyond the Horizon: Adventures in Faraway Lands. Washington, D.C.: National Geographic Society, 1992.
Lua MLA (9ú heag.)National Geographic society. Beyond the Horizon: Adventures in Faraway Lands. National Geographic Society, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.