Siapno, F. E. (1998). Green brigade: A call to environmental action. Manila Bulletin.
芝加哥风格引文Siapno, Freriel E. "Green Brigade: A Call to Environmental Action." Manila Bulletin 1998.
MLA引文Siapno, Freriel E. "Green Brigade: A Call to Environmental Action." Manila Bulletin, 1998.
警告：这些引文格式不一定是100％准确.