APA Style
National Geographic: May 2011. (2011).
USA:
National Geographic Society.
Chicago Style
National Geographic: May 2011.
May 2011.
USA:
National Geographic Society,
2011.
Perpustakaan KALBIS.
IEEE Style
*IEEE style untuk Skripsi
National Geographic: May 2011.
May 2011.
May 2011.
USA:
National Geographic Society.
*IEEE style untuk Buku/Jurnal
National Geographic: May 2011.
May 2011.
May 2011.
USA:
National Geographic Society,
2011.
MLA Style
National Geographic: May 2011.
May 2011.
USA:
National Geographic Society,
2011.
Perpustakaan KALBIS.
Turabian Style
National Geographic: May 2011.
USA:
National Geographic Society,
2011.
Perpustakaan KALBIS.