Osmena, S. (1939). Philippine-American trade: Its relation to our economic problems.
Chicago-referens (17:e uppl.)Osmena, Sergio. Philippine-American Trade: Its Relation to Our Economic Problems. 1939.
MLA-referens (9:e uppl.)Osmena, Sergio. Philippine-American Trade: Its Relation to Our Economic Problems. 1939.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.