Philippines (Republic). Board of Investments. (1973). Foreign investments. s.n.
Chicago-referens (17:e uppl.)Philippines (Republic). Board of Investments. Foreign Investments. [Pasig, Rizal: s.n, 1973.
MLA-referens (9:e uppl.)Philippines (Republic). Board of Investments. Foreign Investments. s.n, 1973.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.