Lua APA (7ú heag.)

Billones, W. (1999). State of RP's earthquake preparedness. Manila Times.

Lua i Stíl Chicago (17ú heag.)

Billones, William. "State of RP's Earthquake Preparedness." Manila Times 1999.

Lua MLA (9ú heag.)

Billones, William. "State of RP's Earthquake Preparedness." Manila Times, 1999.

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