Ong, E. D. (2004). Research firms highlight hot trends in outsourcing. Manila Bulletin.
Lua i Stíl Chicago (17ú heag.)Ong, Edison D. "Research Firms Highlight Hot Trends in Outsourcing." Manila Bulletin 2004.
Lua MLA (9ú heag.)Ong, Edison D. "Research Firms Highlight Hot Trends in Outsourcing." Manila Bulletin, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.