Mercurio, R. Interest in Phl upstream oil, gas sector remains strong - DOE. The Philippine Star..
Chicago-referens (17:e uppl.)Mercurio, Richmond. "Interest in Phl Upstream Oil, Gas Sector Remains Strong - DOE." The Philippine Star. .
MLA-referens (9:e uppl.)Mercurio, Richmond. "Interest in Phl Upstream Oil, Gas Sector Remains Strong - DOE." The Philippine Star., .
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.