Chanco, B. (2001). Telecoms clearning house not needed. IN Demand and supply [column]. Philippine Star.
Chicago-referens (17:e uppl.)Chanco, Boo. "Telecoms Clearning House Not Needed. IN Demand and Supply [column]." Philippine Star 2001.
MLA-referens (9:e uppl.)Chanco, Boo. "Telecoms Clearning House Not Needed. IN Demand and Supply [column]." Philippine Star, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.