Gaya APA
Downs, Roger M.. (2005).
Almanac of Geography .
Washington:
National Geographic.
Gaya Chicago
Downs, Roger M..
Almanac of Geography.
Washington:
National Geographic,
2005.
Reference.
Gaya MLA
Downs, Roger M..
Almanac of Geography.
Washington:
National Geographic,
2005.
Reference.
Gaya Turabian
Downs, Roger M..
Almanac of Geography.
Washington:
National Geographic,
2005.
Reference.