Guineden, D. (2000). Abu Sayyaf: A tough nut to crack. Philippine Graphic.
Cita Chicago Style (17a ed.)Guineden, Darra. "Abu Sayyaf: A Tough Nut to Crack." Philippine Graphic 2000.
Cita MLA (9a ed.)Guineden, Darra. "Abu Sayyaf: A Tough Nut to Crack." Philippine Graphic, 2000.
Precaución: Estas citas no son 100% exactas.