Παραπομπή APA

(1990). Maps: Every foldout map from National Geographic Magazine on cd-rom. Washington, DC: National Geographic Interactive.

Παραπομπή Chicago Style

Maps: Every Foldout Map From National Geographic Magazine On Cd-rom. Washington, DC: National Geographic Interactive, 1990.

Παραπομπή MLA

Maps: Every Foldout Map From National Geographic Magazine On Cd-rom. Washington, DC: National Geographic Interactive, 1990.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.