Santos, S. (2003). Guingona renews warning on Charter change. Philippine Star.
Chicagoスタイル(17版)引用形式Santos, Sammy. "Guingona Renews Warning on Charter Change." Philippine Star 2003.
MLA(9版)引用形式Santos, Sammy. "Guingona Renews Warning on Charter Change." Philippine Star, 2003.
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