APA Style

National Geographic December 2012. (2012). New York: National Geographic Society.

Chicago Style

National Geographic December 2012. Vol.222 No.6. New York: National Geographic Society, 2012. Perpustakaan KALBIS.

IEEE Style

*IEEE style untuk Skripsi

National Geographic December 2012. Vol.222 No.6. Vol.222 No.6. New York: National Geographic Society.

*IEEE style untuk Buku/Jurnal

National Geographic December 2012. Vol.222 No.6. Vol.222 No.6. New York: National Geographic Society, 2012.

MLA Style

National Geographic December 2012. Vol.222 No.6. New York: National Geographic Society, 2012. Perpustakaan KALBIS.

Turabian Style

National Geographic December 2012. New York: National Geographic Society, 2012. Perpustakaan KALBIS.