APA Style

National Geographic: Our Greatest Journey | Vol. 224 No.6 | Desember 2013. (2013). USA: National Geographic Society.

MLA Style

National Geographic: Our Greatest Journey | Vol. 224 No.6 | Desember 2013. Vol. 224 No.6 | Desember 2013. USA: National Geographic Society, 2013. Perpustakaan KALBIS.