Calica, M. A. L. (2005). GMA vows to break oil cartel. Philippine Star.
芝加哥风格引文Calica, Ma. Aurea L. "GMA Vows to Break Oil Cartel." Philippine Star 2005.
MLA引文Calica, Ma. Aurea L. "GMA Vows to Break Oil Cartel." Philippine Star, 2005.
警告：这些引文格式不一定是100％准确.