Villegas, B. M. (1989). Improving the lines of 18m Filipinos. IN The Positive sum game [column]. Manila Chronicle.
Lua i Stíl Chicago (17ú heag.)Villegas, Bernardo M. "Improving the Lines of 18m Filipinos. IN The Positive Sum Game [column]." Manila Chronicle 1989.
Lua MLA (9ú heag.)Villegas, Bernardo M. "Improving the Lines of 18m Filipinos. IN The Positive Sum Game [column]." Manila Chronicle, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.