Villanueva, M. A. (2004). Purisima named GMA's economic spkesman. Philippine Star.
芝加哥风格引文Villanueva, Marichu A. "Purisima Named GMA's Economic Spkesman." Philippine Star 2004.
MLA引文Villanueva, Marichu A. "Purisima Named GMA's Economic Spkesman." Philippine Star, 2004.
警告：这些引文格式不一定是100％准确.