(1991). 1990=Nineteen hundred and ninety Power Development Program. Manila Chronicle.
Lua i Stíl Chicago (17ú heag.)"1990=Nineteen Hundred and Ninety Power Development Program." Manila Chronicle 1991.
Lua MLA (9ú heag.)"1990=Nineteen Hundred and Ninety Power Development Program." Manila Chronicle, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.