Gaya APA
Birdsall, Stephen S. (2005).
Geografi Amerika .
New York:
US Departement of state.
Gaya Chicago
Birdsall, Stephen S.
Geografi Amerika.
New York:
US Departement of state,
2005.
Non-fiction.
Gaya MLA
Birdsall, Stephen S.
Geografi Amerika.
New York:
US Departement of state,
2005.
Non-fiction.
Gaya Turabian
Birdsall, Stephen S.
Geografi Amerika.
New York:
US Departement of state,
2005.
Non-fiction.