De Vera-Ruiz, E. 196 nations back eco preservation. Manila Bulletin.
芝加哥风格引文De Vera-Ruiz, Ellalyn. "196 Nations Back Eco Preservation." Manila Bulletin .
MLA引文De Vera-Ruiz, Ellalyn. "196 Nations Back Eco Preservation." Manila Bulletin, .
警告：这些引文格式不一定是100％准确.