(1955). The American nautical almanac for the year 1957. United States Government Printing Office.
Chicago-referens (17:e uppl.)The American Nautical Almanac for the Year 1957. Washington: United States Government Printing Office, 1955.
MLA-referens (9:e uppl.)The American Nautical Almanac for the Year 1957. United States Government Printing Office, 1955.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.