Sala, H. J. (1998). Heroes: People who made a difference in our world. OMF Literature.
芝加哥风格引文Sala, Harold J. Heroes: People Who Made a Difference in Our World. Manila: OMF Literature, 1998.
MLA引文Sala, Harold J. Heroes: People Who Made a Difference in Our World. OMF Literature, 1998.
警告：这些引文格式不一定是100％准确.