Angeles, E. Y. (1997). Distance learning. IN Educators speak [column]. Manila Bulletin.
芝加哥风格引文Angeles, Emmanuel Y. "Distance Learning. IN Educators Speak [column]." Manila Bulletin 1997.
MLA引文Angeles, Emmanuel Y. "Distance Learning. IN Educators Speak [column]." Manila Bulletin, 1997.
警告：这些引文格式不一定是100％准确.