League of Nations. (1928). Official vital statistics of Switzerland. [s.n.].
Citazione stile Chigago Style (17a edizione)League of Nations. Official Vital Statistics of Switzerland. Geneva: [s.n.], 1928.
Citatione MLA (9a ed.)League of Nations. Official Vital Statistics of Switzerland. [s.n.], 1928.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.