Dyfyniad APA

League of Nations. (1928). Official vital statistics of Switzerland. [s.n.].

Dyfyniad Arddull Chicago

League of Nations. Official Vital Statistics of Switzerland. Geneva: [s.n.], 1928.

Dyfyniad MLA

League of Nations. Official Vital Statistics of Switzerland. [s.n.], 1928.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.