Santos, S. (2003). Guingona renews warning on Charter change. Philippine Star.
芝加哥风格引文Santos, Sammy. "Guingona Renews Warning on Charter Change." Philippine Star 2003.
MLA引文Santos, Sammy. "Guingona Renews Warning on Charter Change." Philippine Star, 2003.
警告：这些引文格式不一定是100％准确.