Pampolina, R. (2002). Natural gas vehicle program, inilunsad. Kabayan.
Cita Chicago (17th ed.)Pampolina, Rexy. "Natural Gas Vehicle Program, Inilunsad." Kabayan 2002.
Cita MLA (9th ed.)Pampolina, Rexy. "Natural Gas Vehicle Program, Inilunsad." Kabayan, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.