Shell helps improve Philippine air quality by developing new energy sources. IN Business Lifestyle. The Philippine Star.
芝加哥风格引文"Shell Helps Improve Philippine Air Quality by Developing New Energy Sources. IN Business Lifestyle." The Philippine Star .
MLA引文"Shell Helps Improve Philippine Air Quality by Developing New Energy Sources. IN Business Lifestyle." The Philippine Star, .
警告：这些引文格式不一定是100％准确.