National Geographic society. (1992). Beyond the horizon: Adventures in faraway lands. National Geographic Society.
Chicago-referens (17:e uppl.)National Geographic society. Beyond the Horizon: Adventures in Faraway Lands. Washington, D.C.: National Geographic Society, 1992.
MLA-referens (9:e uppl.)National Geographic society. Beyond the Horizon: Adventures in Faraway Lands. National Geographic Society, 1992.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.