League of Nations. (1928). Official vital statistics of Switzerland. [s.n.].
Chicago-referens (17:e uppl.)League of Nations. Official Vital Statistics of Switzerland. Geneva: [s.n.], 1928.
MLA-referens (9:e uppl.)League of Nations. Official Vital Statistics of Switzerland. [s.n.], 1928.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.