Lua APA (7ú heag.)

Perpeña, E. C. (2001). Garbage crisis mirrors social decay. Manila Times.

Lua i Stíl Chicago (17ú heag.)

Perpeña, Ed C. "Garbage Crisis Mirrors Social Decay." Manila Times 2001.

Lua MLA (9ú heag.)

Perpeña, Ed C. "Garbage Crisis Mirrors Social Decay." Manila Times, 2001.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.