Asis, F. K. (2001). Survival of the fittest for the elephants. Manila Bulletin.
芝加哥风格引文Asis, Fe Katherina. "Survival of the Fittest for the Elephants." Manila Bulletin 2001.
MLA引文Asis, Fe Katherina. "Survival of the Fittest for the Elephants." Manila Bulletin, 2001.
警告：这些引文格式不一定是100％准确.