League of Nations. (1926). The official vital statistics of the Republic of Portugal. [s.n.].
Chicago-viite (17. p.)League of Nations. The Official Vital Statistics of the Republic of Portugal. Geneva: [s.n.], 1926.
MLA-viite (9. p.)League of Nations. The Official Vital Statistics of the Republic of Portugal. [s.n.], 1926.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.