Gaya APA
Tumas, A. (2012).
Poster: 1863: Titik Balik Perang Saudara: National Geographic .
:
National Geographic Indonesia.
Gaya MLA
Tumas, Alejandro.
"Poster: 1863: Titik Balik Perang Saudara: National Geographic".
:
National Geographic Indonesia,
2012.
Text.