(1966). Niger; official standard names approved by the United States Board on Geographic Names.
Chicago-referens (17:e uppl.)Niger; Official Standard Names Approved by the United States Board on Geographic Names. 1966.
MLA-referens (9:e uppl.)Niger; Official Standard Names Approved by the United States Board on Geographic Names. 1966.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.