Pampolina, R. (2002). Natural gas vehicle program, inilunsad. Kabayan.
芝加哥风格引文Pampolina, Rexy. "Natural Gas Vehicle Program, Inilunsad." Kabayan 2002.
MLA引文Pampolina, Rexy. "Natural Gas Vehicle Program, Inilunsad." Kabayan, 2002.
警告：这些引文格式不一定是100％准确.