League of Nations. (1926). The official vital statistics of the Republic of Portugal. [s.n.].
芝加哥风格引文League of Nations. The Official Vital Statistics of the Republic of Portugal. Geneva: [s.n.], 1926.
MLA引文League of Nations. The Official Vital Statistics of the Republic of Portugal. [s.n.], 1926.
警告：这些引文格式不一定是100％准确.