Estupigan, R. (1999). Philippine tourism industry on the uprising. Manila Bulletin.
Lua i Stíl Chicago (17ú heag.)Estupigan, Ruth. "Philippine Tourism Industry on the Uprising." Manila Bulletin 1999.
Lua MLA (9ú heag.)Estupigan, Ruth. "Philippine Tourism Industry on the Uprising." Manila Bulletin, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.